1284:(1) The text, if it belongs in the article at all, is in the wrong section. The text does not belong here. There is a long list of things for which the concept of frequency is important, we aren't going to talk about all of them in the "definitions and units" section. (2) The text is true but not true enough: (2a) With waves speed is always "mathematically related" (i.e. equal to the product) to frequency and wavelength, that fact is not specific to "wireless communications". (2b) The 300 used is the speed of light in a vacuum, although we neglect to mention that point, but this isn't the page for quick rule-of-thumb formulae for radio technicians. (2c) Elementary maths gives us one formula from the other so, once again, not useful here. (3) Everything is already covered in the "physics of light" example section.
822:
frequency... That is, if you have a slinky... and start sending pulses through it at a fixed speed, changing the frequency with which you initiate the pulses will only affect the wavelength, and vice-versa (i.e., frequency is NOT invariant). Representing this fact as well would probably make the article more sensible-seeming to those who really don't know anything about waves. I mean, strictly speaking, since the article is a general description of the quantity
Frequency, with respect to other common quantities or terms used to describe the nature or behaviour of waves and signals - e.g., period, phase, amplitude, wavelength, cycle, etc. - this rather random statement about the Invariance of Frequency is not true, at least not without some context. - joe
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frequency, it has a spectral distribution over a whole range of frequencies. The color of a pair of socks is not uniquely determined by any particular "frequency" but by the complex interaction of light, the optical properties of the material, and the human vision system. We have sections just a short distance below the lead that explain in detail. I would suggest that any mention of color or pitch not imply that "freqeuncy" of light or sound is the unique determinant. We can't teach all of physics to someone standing on one foot, but we shuold at least avoid a quick 'n'dirty statement in the lead that is going to take paragraphs to unwind and correct later. Have you got a suggested wording? --
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sometimes down) was counted and this gave the number of waves and, as a time measure, the zero-crossing period. The parameter is estimated by taking the mean of these periods for a given wave record. For wave records on paper the mean level is found by eye and
Tvisual is estimated from the record length and the number of zero up-crossings counted on the record. This method can also be applied to digitised data using a computer but if the wave records are available in machine readable form it is preferable to estimate from the moments of the spectrum using,
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in terms of a frequency spectrum, given by the
Fourier transform of the original signal." There are conditions under which the Fourier transform exists, and conditions under which it doesn't; it doesn't exist, for example, for a stationary noise signal, nor strictly for a sinusoid (you can extend it to include delta functions to allow the latter, but that doesn't help the former). And there are severe limits on the extent to which a Fourier transform has much say about a sound's pitch, too. I'd be happy to expound on these problems if you like.
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2293:"Frequency is also a characteristic of waves" is true with a little stretching. And "It is used to describe the pitch of musical tones" is certainly true, since pitch is quantified as hertz. But "used to describe...the color of light" may be too much of a stretch, since color is not a one-dimensional thing like frequency, or like the simple conception of pitch. You often see confusions like "what is the wavelength (or frequency) of purple? of brown? etc." that we don't want to feed. Can we just leave out the bit about color?
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there, the media constants over here were pretty close to vacuum. When the train is here, the media constants differ greatly from vacuum. The moving train is in effect a time dependent distribution of the media parameters. E&M propagation is not linear if the media is time dependent. Which, of course we know because it generates frequencies at its output that were not in the input. And if you are more into math, sine waves are Eigen functions of linear time invariant differential equations.
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2598:, which has long been a temporal phenomenon. The idea of something being frequent in time was borrowed by science to construct the much more recent idea that "spatial frequency" is not about time but about occurrences over area. As such "spatial frequency" is relatively unimportant; a small percentage of humanity uses the term. (It appeared first in 1878 in a study of hemophiliacs, talking about their prevalence in a population or geographic area; the term was quickly criticized for its inaccuracy.
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explain a basic concept like pitch and color without footnotes? If a relationship is so complex it can't be even mentioned without a forest of qualifications and explanations, maybe it doesn't belong in the lead section at all. "A little inaccuracy sometimes saves a ton of explanation." and I don't think obsessively qualifying the lead paragraph with every historical and relativistic factor helps the lucidity at all. And I've never said a non-sarcastic thing in my life, ask anyone. --
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2437:, and renamed them to be just Light and Sound, since they're supposed to be about frequency, not about physics. It's interesting that the sound one says "Frequency is the property of sound that most determines pitch," which is true for repetitive sound waves according to the definition of frequency given, but completely misses the opportunity to address the oft-discussed disconnect between frequency and pitch in psychoacoustics. Project for another time...
1849:. We should not equate frequency of light with color perception, we should not go off on a tangent about non-oscillatory sounds (whatever that could be), and we must not drag in the whole mathematics textbook in the lead section. I don't like "helps determine", abstract concepts are not Boy Scouts helping little old ladies across the street. Freqeuncy is perhaps the major factor in determining (the perception of) pitch, but it's not absolute. --
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DC or see DC, at any rate; gotta be oscillating to be heard, and the ear is its own
Fourier analzyer. I don't care to speculate on what other Wiki editors call the real world as my notions of what they consider real and notable seem to have low utility for predicting their behavior. Do we really need all that ponderous oscillation stuff in the lead? --
1585:
in how pitch is perceived, but controlling for all that stuff, frequency is the property of sound waves that most determines pitch. Are there other properties of light waves (or whatever you call them!) that determine color, and are they as important as frequency? Sound pressure can affect pitch perception, but it's influence is secondary.
1766:, which is pretty badly behaved; it's sort of OK for light of a constant color, and perhaps of some use for a sound of a constant pitch, but not much good for a real sound like a song. Anyway, having a Fourier transform is still remote from having a frequency, and getting into spectrum in this article is probably outside its scope.
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previous paragraph as something related to periodic oscillations, so intuitively the concept of "frequency" seems unrelated to a constant stream of sound. Imagine you don't know how sound works, then you would read the phrase "the frequency of sound" like you or I would read the phrase "the frequency of a pencil".
3036:". The vectors are orthogonal, but the electric and magnetic fields are in phase; the peaks occur simultaneously (in most circumstances; in materials with an imaginary index of refraction they can be out of phase). On your addition, my feeling is that the subject of the wave/particle nature of light is a little
2227:) I would say even considering footnotes in the introduction is an indication that it's getting too pedantic. How about something like: "Frequency is also a characteristic of waves, such as sound waves, radio waves, and light waves. It is used to describe the pitch of musical tones and the color of light." --
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By the way, I have the same goal as you: Clear and pedagogical and easy-to-read and accurate text. I don't think many wikipedia physics articles achieve this, and I try hard to improve them bit by bit. I hope I'm successful most of the time, even if I sometimes make bad edits. Please stop bringing up
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Oh yeah, P3 is the
Wikiest one of all. And everyone knows the frequency of a sound must be determined at the Big Bang and never change until the end of time. Let's try and work in the Doppler effect and at least first-year relativity, too, while we're at it, and make it perfectly general. (To make it
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I'd prefer to have the lead stay simpler, and strictly truthful. To introduce
Fourier transforms and spectra here is not a good idea; a section in the article about that would be OK. But it would be better not to say untrue things like "Any time-varying disturbance... can be alternatively described
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I think that's too much detail for the lead paragraph; most of the knowledge about pitch and color was worked out long before we had the ability to measure "cycles per second", and frequency isn't really a sole determinant of color; "white" is very important to color, but "white light" doesn't have a
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There ought to be an overview of how frequency is relevant to your perception of, say, light and sound in the lead. I can't tell you how many audio-related pages link to this one, expecting it to explain how frequency is the property of sound that most determines pitch. Until just now it didn't. I've
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I removed the non sequitur "Notes" heading and its entry about the human heartbeat being close to one Hertz. Actually, the human heartbeat varies quite a bit--it can get down to 0.8 Hertz in mellow marathoners and up to 2 Hz in times of high stress activity. Average heart rate is about 72 bpm, or 1.2
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You guys probably settled this a long time ago, but
Doppler shift is not linear operation the EM field. It is caused by something in motion, and that something in motion means the media constants are functions or time. Suppose a steam engine was over there and now it is over here. When it was over
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What about the
Invariance of Speed, with regard to a constant medium? The above discussion and corresponding paragraph in the article both make some broad assumptions about the source of the Waves. It is also true that if the medium remains the same, speed is invariant with regard to wavelength and
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Hi, see it implicitly means 1 event, and 1 here is full of meaning, but (number of) event has no dimension, because it is a number. So Hertz not means "one per second", but it means "one event per second", i.e., one (or 1) here, is full of meaning. Hertz does not mean 1 "kilometer" per second or one
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Somewhere between 1,000 and 4,500 people visit this page every day. I think it might be useful to take a look at the pages that link here to try and get a sense of what the readers' needs are, and then to expand the lead so as to better orient them. It's nice after you've clicked on a link to a page
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For sound waves, the pressure can't change instantaneously - define "frequency" as "time rate of change of phase" and you can get the notion that an "instantaneous frequency" can be defined for every instant (ok, maybe not uniquely). Every sound you can hear is just a 1000 Hz carrier that started at
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The main problem that I see is that if the sound wave is, say, five seconds of human speech, it doesn't really have a pitch and it doesn't really have a frequency. Another problem is that people who don't know how sound work will wonder what it means for sound to have a frequency. So then I thought,
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Let's see, there's nothing older than the Big Bang, and nothing farther than mumblety-million light years, so yes, I guess I do mean finite in time and in amplitude. I was more concerned with the condition of finite numbers of discontinuities, actually, but those other attributes help. We can't hear
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Ah ha. Excellent points. To be perfectly honest, I am thinking of the needs of people who read articles on audio and I know nothing about optics, but it in broad overall principle it sounds vaguely similar to sound wave perception. Room acoustics and neurocognitive factors play a very important role
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This period is important for power estimation and is used in wave power design as a preferred comparator. The most appropriate way to consider energy period is as the period of the regular wave that has the same significant height and the same power density as the sea-state under consideration. It
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The most likely height of the highest wave in a record of duration 3 hours is Hmax and Tmax is its period. It is often obtained indirectly from Tz or Tp using empirical relationships, or from Hmax and steepness assumptions – usually to obtain a range of possible associated periods. These methods
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I don't think so. Time flows at a different speed depending on your distance from the Earth or another body. If you took a huge loudspeaker and put it in a hot air balloon, time would pass at different rates for you and the speaker, so the frequency would be shifted, since frequency is really just
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I'm not sure if it's worth pointing out, but the frequency of a pre-recorded signal can certainly be changed by playing it back at a different speed. Practically, if you sample something with an incorrect sampling frequency (you think it's 48 kHz but the oscillator's actually running at 48.01 kHz),
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Do you think it's a problem to say "the frequency of sound", when it's not obvious that sound has anything to do with oscillations? I mean, when you hear a long musical note, it sounds like a constant stream of sound, so isn't it weird to say it has a frequency? Frequency was just introduced in the
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The proposed alternatives have been to rely on
Fourier transforms, or to rely on the assumption that all waves are oscillations that have a frequency. I don't see how either of those could be seen as an improvement. What else you got? What, by the way, is the frequency of the sound entering your
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It's correct. Suppose the wave propagates 340 metre per second in the first medium, and 680 m/s in the second, and suppose the frequency is 340 hertz so that the period (i.e. the time it takes for one complete oscillation) is 1/340 seconds. These values fit a sound (a rather deep tone) passing from
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My proposed text consisting of two subsections to replace the "Light" subsection appears above, embedded in this talk section. By "meaningful", I mean treated as such by the cited sources. For example, cold neutrons show wave-like behaviour, but the sources cited there don't consider frequency. I
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Radio waves and microwaves are electromagnetic waves, consisting of spatially orthogonal electric and magnetic fields oscillating together in both time and space, traveling through space. The wavelengths are in the range of many meters to a few millimeters, corresponding to frequencies that can be
1398:
No. Firstly, assume good faith. Secondly, xkcd is a comic (singular) and not a corporation, team or trained knowledge-fighting force all bent on destroying wikipedia. 217.23.232.41, you have yourself proven to be attributing more troll-like behaviour, having recently launched your own "one soldier
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I think most of the 'Physics of sound' section should be removed. Description of longitudinal vs. transverse waves, polarization, etc. are not necessary for the explanation of frequency of sound waves, and simply repeat coverage in other articles. This is where 'Knowledge bloat' comes from. All
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Frequency is important in wireless communications, where the frequency of a signal is mathematically related to the wavelength. If f is the frequency of an electromagnetic field in free space as measured in megahertz, and w is the wavelength as measured in meters, then w = 300/f and conversely f =
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to know from the lead why you're there. As someone who's just started learning about audio engineering concepts, I have to say I couldn't tell right away what frequency had to do with anything... and then I figured it out and added information about pitch. Yes, some of us really are that dumb!:)--
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This sort of answers my first complaint above but not the second. Anyway, this isn't very good because "oscillating sound wave" probably makes people think of like tremolo or vibrato, which is totally different. Another problem is that, even if the waveform is exactly oscillatory, the oscillation
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Well, I think I'll let you guys handle it. I'm too conflicted, as I spend a large part of my professional life in hearing research where I'm constantly trying to deconfuse people about frequency versus pitch, so this has become a hot button for me. My favorite quote: "...dehydrated cats and the
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Oh very good. This is exactly how we'd explain it to the first-year physics class. We don't need
Fourier transforms at all (in the lead), and I'm not convinced there's no sound or light that aren't waves. But aren't you also concerned we've left out the relativistic corrections that are such an
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page says a wave is a propagating disturbance; there's no particular reason why a wave would be an oscillation, or be periodic, or have a frequency. And having a frequency spectrum is a much more complicated concept, which doesn't accord well with the topic, nor does it support the sentence that
1245:
This is equivalent to dividing the length of the wave record by the number of crests where a crest is any point either side of which the surface elevation decreases. Crests are not necessarily associated with zero up-crossings. Clearly this is very much influenced by the ‘tail’ of the spectrum
2193:
If it were only two or three editors , you wouldn't necessarily get the group-think mush; it takes scores of editors to produce the Knowledge effect at its highest level. It is useful to point out flaws in articles in general so that we can perhaps avoid the flaws in this article. Surely we can
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My feeling is that's not necessary. "Temporal frequency" is the most common meaning of "frequency" and the other common meanings can be distinguished in the introduction, and for less common there's the hatnote directing readers to the DAB page. I think it's irritating to readers to use some
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Steve, I don't think it's possible for W to talk w/o sarcasm, based on my experience. If you go ahead and try something, he'll tell you if he doesn't like it, but he has a hard time being constructive. So go for it. I don't like footnotes, either, as they too often become a hiding place for
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Not sarcasm, just another observation on how the group-think editing model usually produces unreadable prose; it's not confined to this article, it's a common Knowledge fault. How about "The frequency of sound relates to its pitch, and the frequency of light is the most important factor in the
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When recordings were first taken this was onto charts and simple counts could be made. First the charts were zero-meaned (the average and trend calculated and drawn through the plot to provide a new axis for measuring) and then the number of times the wave record crossed the mean going up (or
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I was just wondering about the comment that when a wave goes from one medium to another, the frequency remains more or less the same, only the wavelength changes -- this doesn't make sense to me. If frequency has an inverse relationship to wavelength, how can one change without the other?
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The significant wave period is the mean of the zero up-crossing periods associated with the highest one third of the waves. It is sometimes denoted by Ts. Note that this parameter cannot be obtained directly from the wave spectrum. It is not very useful, but sometimes is used!
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where the mi values are spectral moments. The alternative symbol of Tm0,2 is derived from the moment equation. It can be seen that TZ is very dependent on the higher frequency end of the spectrum and although TZ is the most commonly used period estimator it is not very stable.
2015:
OK, now this is accurate I think...but maybe too many words and too many new concepts for readers ("what does sinusoidally mean?, etc...") Or maybe it's OK? Or maybe a better approach is to take P1 and just slap a giant footnote on it... I'll think more later. :-P
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I couldn't disagree more. There are far too many articles on audio equipment and acoustics and music that link to this page expecting it to explain what frequency has to do with sound. I recently added information about pitch, because it wasn't there and I needed
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Wtshymanski, could you copy-and-paste some text, or link to an old revision of the article, that you really like? Then we can discuss whether or not it is misleading, and if so whether or not it can be fixed with rewording or links or footnotes or whatever. :-)
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Binksternet's misunderstanding is exactly the reason why I proposed the renaming. Frequency may have originally started as synonym of temporal frequency, but it's outgrown that definition, e.g., spatial frequency is obviously a non-temporal type of frequency.
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the sorry state of wikipedia science articles in general, because it sounds like you're blaming me and Dicklyon personally for every bad science article. I doubt that's your intention, but still...let's please just discuss the frequency article. :-) Thanks, --
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If by real world you mean finite in duration and finite in amplitude, then yes, it will have a Fourier transform. But it won't be useful, in general, and in particular won't have any feature identifiable with pitch, for most sounds. Basically it's a
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unsourced interpretation and rambling. I think that if you have a short thing in the lead that mentions frequency of sound, as long as it doesn't strongly claim that sound has a frequency, should be OK. You can elaborate more carefully later.
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perception of color." (as distinct from ampitude, say) or something like that. Never mind the waveforms and Fourier transforms, Aristotle and Newton had the gist of the properties of color and sound worked out well before the maths came along. --
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Hz. No studies support the statement that the heartbeat is exactly 60 beats per minute which means there's no benefit to the reader by announcing that the heartbeat is approximately 1 Hz. It doesn't shed any light on the concept of frequency.
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1/2 wavelength). It should be possible to use the steepness method in shallow water provided that refraction is minimal and that allowance can be made for shoaling effects. It cannot, however, be derived directly from the wave spectrum.
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Right. The majority of readers, the ones who need the introduction, are nontechnical readers who are looking for the simplest possible explanation. The techies will skim or skip the intro and go to the more technical sections below.
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The spectral peak period is the inverse of the frequency at which the value of the frequency spectrum is a maximum. It cannot be defined satisfactorily in multi-peaked spectra. fp is very important in characterising spectra.
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important feature of so many Knowledge articles? We must beat the reader to death with every conceivable qualification and limitation in the lead; othjerwise there's the chance they won't be overawed with our smartness. --
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This is the inverse of the average frequency calculated from the mean of all component sine waves weighted by the spectral energy. It cannot be measured in the time domain unless the waves are simple sine curves.
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I like that a little better, and maybe that's as close as we can get...color perception is distressingly complicated but we don't need to get into the problems of color perception in this very peripheral article.
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that should appear is a simple exposition of sound wave frequency, mention of how it's measured, and maybe something on the 'spectrum' of sound frequencies analogous to the spectrum of electromagnetic waves. --
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I made a change in the lead already. Light waves and sound waves are propagating disturbances, and are waves, but are not necessarily "oscillations" in the sense that means periodic and having a frequency.
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into waters too deep. (I am unsure about that page 111 in the 2nd edition. I am also unsure whether I should have left this code in a sandbox, but I feared a sandbox may be too volatile for the archive.)
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air into a somewhat harder medium. Then, in air, this sound travels 1 metre per period, so the wavelength is 1 metre. In the harder medium, it will travel 2 metre in the same time, doubling the wavelength.
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So you don't like the idea of having a footnote? Why not? I like how you made it sound more vague ("relates to"), that way people will continue to look for more details if they need to know more details.
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The trouble is, it's not right. It says "Waves, such as sound waves or light waves, are oscillations, and therefore they have a frequency (or frequency spectrum)." But there's no support for this; the
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Frequency in Fourier analysis is a different concept from 1/(period). I don't have time to write an explanation now but I think that concept, and links to appropriate articles, would be helpful here.
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counter offensive" and posting anti-xkcd pseudo rants on all talk sections of articles pertaining to or mentioned by the webcomic. I'm not in favour of more xkcd refs on WP, I'm just wondering who
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for the content in the destination pages and must not be deleted as long as the copies exist. For attribution and to access older versions of the copied text, please see the history links below.
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or any other nonlinear process, frequency is an invariant quantity in the universe. That is, it cannot be changed by any linearly physical process unlike velocity of propagation or wavelength.
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Please add some data to the article saying what variables of waves in sound and light depend on the frequency of the wave. eg speed, impedance, refracting index, attenuation coefficient, etc.
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Thanks for catching the error. I feel that duality, in common with cold neutrons, is topical here as a caveat that wavelike properties constitute no guarantee that frequency is meaningful.
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We have a rather strange paragraph that tells us how to measure frequency by dividing one number by another which is of course true. But do we have anything about various classes of
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Quite correct about pre recorded signals, but Im thinking more of a 'pitch shifting' method but broad band and not using mixers (multipliers). I guess it just can't be done? --
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I think this answers both of the problems I pointed out above. "Note 1" is a footnote and would go in a separate footnote section, like they do in this article-section
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On the other hand, I suppose it can be OK and sometimes necessary to have poorly-explained things in the introduction, which are explained better later in the article.
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text or images borrowed from other web sites or published material; such additions will be deleted. Contributors may use copyrighted publications as a source of
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I don't understand that point, nor what change you are proposing to make to the article. What does it mean for frequency to be "meaningful"? When is it not?
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We cannot say whether light is particle or wave. This is not an either/or situation; light seems to be both particles and waves and thus is probably neither.
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I would have thought any real sound or visual signal will necessarily have a Fourier transform;that non-transformable signals only exist in math texts. --
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Wtshymanski, please stop being sarcastic. You can just say "P3 is too technical and readers will be lost". In fact I agree with that. :-) How about:
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for how to properly implement limited quotations of copyrighted text. Knowledge takes copyright violations very seriously, and persistent violators
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Sure, try that in the article and let's see what consensus tells us. It's better because it doesn't implicitly equate frequency and color. --
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But, I think this ought to be stated in the lead as well so that readers will know why they'd been linked to the frequency page right away.--
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from editing. While we appreciate contributions, we must require all contributors to understand and comply with these policies. Thank you.
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Your suggested alternative wording is? Light waves and sound waves are propagating oscillations and I suppose then a subset of "waves". --
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as a redirect here. Not asking to change the scope of this article, just to have its title reflecting the scope more accurately. Thanks.
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2009:, etc. In the case of visible light, the frequency determines the color, with lower frequency corresponding to red and higher to violet.
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frequency is not necessarily related to the pitch...for example when you play two pure tones together, the waveform oscillates at the
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I don't see the need for doing this. The article is not particularly large, nowhere near splitting size, and the
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Prior content in this article duplicated one or more previously published sources. The material was copied from:
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Oh you're right! You could change frequency just by flying around at a different altitude from your observer.
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Good idea, climbing down the ladder of abstraction usually helps focus the discussion. I prefer something like
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Visible light shares that duality with, e.g., cold neutrons, the "frequency" of which is rarely mentioned.
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If you have discovered URLs which were erroneously considered dead by the bot, you can report them with
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added a very brief explanation of frequency's relationship to pitch in the Physics of sound section.
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OK. I'm not particularly happy with the paragraph but I can't think of any way to improve it. :-) --
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on Knowledge. If you would like to participate, please visit the project page, where you can join
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on Knowledge. If you would like to participate, please visit the project page, where you can join
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before doing mass systematic removals. This message is updated dynamically through the template
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Text has been copied to or from this article; see the list below. The source pages now serve to
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think it can be helpful to reveal not only the meaning of a concept, but also its limitations.
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1952:, but you can't hear the beat frequency at all if it's in the audible range. So then I thought
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article, a clear distinction between periodic and aperiodic frequency units is sourced to the
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of photons, what is conventionally called a "frequency" can be calculated in the usual way:
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Yes, that would be a good addition, aince there is no separate article for that topic. --
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The following Wikimedia Commons file used on this page has been nominated for deletion:
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obscure term for the article title, and it makes it hard to link to the article. From
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I've heard that strong gravitation could change the frequency, so wormholes, why not :)
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in the United States, while in fact 442 Hz in Europe? Perhaps this should be changed.
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If you found an error with any archives or the URLs themselves, you can fix them with
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2077:"The frequency of a sound wave (an oscillation in air pressure) helps determine its
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I'll forgive you. The temporal is the usual meaning, and no qualifier is needed.
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it is duly released under a compatible license. (For more information, please see
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https://web.archive.org/web/20070218175557/http://www.ikalogic.com/freq_meter.php
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The statement depends on the definition of frequency. If using, for instance the
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with the following. I think the present section invites readers unfamiliar with
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be rewritten, but only if it does not infringe on the copyright of the original
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Put differently: Yes, frequency has an inverse relationship to wavelength in a
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to hearing problems became more and more a handicap for research in hearing" (
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Dicklyon, I doubt you're conflicted in a bad way and I hope you reconsider.
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How is this: "Frequency is the property of sound waves that most determines
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2085:(an oscillation in electric and magnetic fields) helps determine its color.
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for an article on frequency, although it probably doesn't hurt. Cheers. --
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to the disambiguation page as its Lead clearly differentiates the term. --
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3257:"kilogram" per second or anything else, it means one "event" per second.
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In an electromagnetic wave, the electric and magnetic fields don't have "
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Frequency is a concept based on occurrences over time, so the adjective
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I have removed the following from the "Definitions and units" section:
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The statement is contradictory since it states frequency is invariant
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medium, but the constant of proportionality depends on the medium.--
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Feynman, Richard P.; Leighton, Robert B.; Sands, Matthew (2005) .
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range. In scientific observations, it is detected as a stream of
1997:. The frequency of the oscillation determines whether the wave is
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A Commons file used on this page has been nominated for deletion
2601:) So you'll forgive me for protecting the much more common use.
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The last citation link links to xkcd for absolutely no reason.
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here). Any musings from anyone as to why this should be so?? --
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This is a simplification, valid if the wave is sinusoidal (a
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The Doppler effect is a linear process and changes frequency.
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then reproduce it correctly, the frequencies will be shifted.
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a change in frequency, though that's even less relevant. —
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for additional information. I made the following changes:
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associated with any particle of such type can be directly
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ears (it's OK to truncate at your birth and your death).
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if you are not the copyright holder of this material, or
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Period associated with the most likely highest wave, Tmax
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but you cant change its frequency. (I'm not considering
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4:13 AM UTC, July 17th, 4350 BC, suitably modulated! --
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follows, which presumes the existence of a frequency.
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In my opinion, this is not a unit of frequency, but of
664:). ie whatever you do to a signal, you can change its
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Knowledge level-4 vital articles in Physical sciences
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3153:using the archive tool instructions below. Editors
1905:"The frequency of a sound wave helps determine its
1169:Hence we can find an expression for Te as follows,
2970:Regarding the interpretation of these quantities,
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2530:(of or related to time) is not needed, redundant.
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2900:. This applies also to massive particles such as
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2841:with much shorter wavelength, in the 400 to 700
2707:If you agree with re-targeting the redirects at
652:Just wondering if any one has thought about why
3341:High-importance electrical engineering articles
3226:Participate in the deletion discussion at the
3139:This message was posted before February 2018.
1989:oscillates sinusoidally, it corresponds to an
559:Is it not true that the A tuning note is only
3291:Knowledge vital articles in Physical sciences
2359:is a more widely used symbol for frequency.
2036:even Wikier, maybe add Tesla in somehow.) --
697:Plus there are things like pitch shifters to
3012:. Vol. 2 (2nd ed.). Addison Wesley. p. 111.
2967:is the frequency and λ is the wavelength.
2100:of the waveform over a short time interval.
1981:of the tone, with higher frequency giving a
250:Knowledge:WikiProject Electrical engineering
3321:C-Class physics articles of High-importance
3306:C-Class vital articles in Physical sciences
2745:Splitting off Measurement section into new
253:Template:WikiProject Electrical engineering
3109:I have just modified one external link on
2943:{\displaystyle \displaystyle f=c/\lambda }
2433:I reworked these old sections by departed
1471:http://www.wavesignal.com/Light/index.html
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1014:Mean zero up-crossing period, TZ or Tm0,2
844:I removed from the bottom of the section
1301:Put 'Physics of sound' section on a diet
869:it can be changed by the Doppler effect.
3336:C-Class electrical engineering articles
2860:conventionally in the range 2.9 to 4.6
2719:would mostly settle the matter; in the
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3131:http://www.ikalogic.com/freq_meter.php
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2963:in a vacuum, or less in other media),
2389:varies across different disciplines.
3010:: The Definitive and Extended Edition
2484:the title chosen should be the one "
2429:Physics of light and physics of sound
1546:Frequency and perception info in lead
1487:"using copyrighted works from others"
690:? Theory of relativity and all that?
2773:I propose to replace the subsection
2686:is already what you would split off?
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424:This article is within the scope of
335:This article is within the scope of
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2381:The relative frequency of usage of
2347:So what is the criterion for using
2317:Why are people coming to this page?
1333:Done. But see new section below.
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233:WikiProject Electrical engineering
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3356:Low-priority mathematics articles
3113:. Please take a moment to review
2907:From the measured wavelength and
1524:from that source. Please see our
851:Apart from being modified by the
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3316:High-importance physics articles
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1479:confirm their prior publication
1172:Te=(64 Pi Power)/ rho g^2 Hs^2
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438:and see a list of open tasks.
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1513:. Accordingly, the material
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1166:power = rho g^2 m0 Te / 4Pi
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1081:Significant wave period, Ts
1067:{\displaystyle sqrt(m0/m2)}
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3106:Hello fellow Wikipedians,
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782:This is a Doppler effect.
721:It could probably be done
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470:project's importance scale
444:Knowledge:WikiProject Time
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2868:.) In common with other
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1185:Average crest period, Tc
1176:Average wave period, Tav
1154:{\displaystyle (m-1/m0)}
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381:project's priority scale
3102:External links modified
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154:High-importance
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79:High‑importance
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43:on Knowledge's
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2898:interferometer
2831:Main article:
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2819:induced in an
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2661:wikt:frequency
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2003:infrared light
1987:electric field
1950:beat frequency
1945:
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1896:The quote is:
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1693:I tried again
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1538:Moonriddengirl
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1363:71.228.164.178
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1288:Paul Beardsell
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983:
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974:84.159.248.246
965:
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960:
943:comment added
927:- i.e. how we
920:
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853:Doppler effect
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744:130.234.198.85
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723:with wormholes
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662:doppler effect
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466:Low-importance
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436:the discussion
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407:Low‑importance
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347:the discussion
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107:Physics portal
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2878:cold neutrons
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2866:photodetector
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2862:electronvolts
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2501:I agree with
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2367:188.83.90.251
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1495:legal reasons
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1475:February 2009
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1405:PenguinCopter
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1384:217.23.232.41
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591:Pitch (music)
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3165:source check
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2882:interference
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2455:
2435:User:Logger9
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2382:
2361:— Preceding
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2324:Atlantictire
2320:
2220:
2217:
2074:
2014:
1967:sinusoidally
1963:air pressure
1958:
1946:
1930:
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1600:Atlantictire
1556:Atlantictire
1553:
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1482:
1468:
1451:91.99.166.67
1442:
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1354:
1321:Atlantictire
1304:
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939:— Preceding
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843:
824:— Preceding
738:— Preceding
710:
698:
660:(apart from
651:
636:
617:131.172.4.45
611:— Preceding
607:
565:— Preceding
558:
465:
425:
377:Low-priority
376:
336:
302:Low‑priority
271:
231:
168:
153:
113:
51:WikiProjects
34:
3252:Boppennoppy
3038:WP:OFFTOPIC
2886:diffraction
2813:time domain
2755:Measurement
2729:Fgnievinski
2713:wave period
2703:Constant314
2688:Constant314
2669:Fgnievinski
2603:Binksternet
2566:Fgnievinski
2555:Binksternet
2532:Binksternet
2466:Fgnievinski
2413:Fgnievinski
2241:Wtshymanski
2225:WP:MOSINTRO
2214:Wtshymanski
2196:Wtshymanski
2127:Wtshymanski
2053:Wtshymanski
2038:Wtshymanski
1965:oscillates
1931:oscillating
1851:Wtshymanski
1819:Wtshymanski
1783:Wtshymanski
1764:periodogram
1749:Wtshymanski
1666:Wtshymanski
1614:Wtshymanski
1572:Wtshymanski
1503:information
1499:copyrighted
1477:; archives
1445:—Preceding
1439:It depends!
1378:—Preceding
1357:—Preceding
1255:Kraaiennest
989:Binksternet
919:Measurement
903:Constant314
885:Kraaiennest
352:Mathematics
343:mathematics
299:Mathematics
3275:Categories
3202:Report bug
2890:wavelength
2888:. Hence a
2594:came from
2511:SCalhotrod
2456:Rename to
2083:light wave
2007:radio wave
1971:sound wave
1939:light wave
1920:how about
1911:light wave
1870:von Bekesy
1522:plagiarize
784:GoldenBoar
666:wavelength
3185:this tool
3178:this tool
3111:Frequency
3084:Layzeeboi
3053:Layzeeboi
3043:Chetvorno
2984:Layzeeboi
2896:using an
2760:Chetvorno
2717:frequency
2592:frequency
2559:Chetvorno
2503:Chetvorno
2491:Chetvorno
2462:Frequency
2460:and keep
2269:Chetvorno
2230:Chetvorno
2090:pure tone
1975:pure tone
1973:called a
1507:sentences
1351:Vandalism
1309:Chetvorno
954:Chetvorno
806:Omegatron
767:Omegatron
727:Omegatron
703:Omegatron
658:invariant
654:frequency
595:Omegatron
540:Frequency
517:Frequency
75:Acoustics
39:is rated
3191:Cheers.—
3067:Dicklyon
2902:neutrons
2894:measured
2847:massless
2790:Examples
2633:Dicklyon
2596:frequent
2528:temporal
2452:Renaming
2439:Dicklyon
2391:Dicklyon
2363:unsigned
2295:Dicklyon
2167:Dicklyon
1874:Dicklyon
1798:Dicklyon
1768:Dicklyon
1713:Dicklyon
1681:Dicklyon
1646:Dicklyon
1447:unsigned
1426:Ccrrccrr
1380:unsigned
1359:unsigned
1335:Dicklyon
929:actually
826:unsigned
740:unsigned
725:. :-) —
699:simulate
670:velocity
613:unsigned
579:contribs
571:Trhaynes
567:unsigned
3115:my edit
2972:Feynman
2874:massive
2872:, even
2854:photons
2852:called
2821:antenna
2749:article
2659:As per
2340:versus
1993:called
1534:blocked
1511:phrases
941:undated
668:and or
641:Niels Ø
536:history
526:Copied
513:history
503:Copied
468:on the
379:on the
274:on the
156:on the
129:Physics
120:Physics
70:Physics
41:C-class
2953:where
2858:energy
2514:(Talk)
1961:"When
1483:unless
1401:really
674:mixers
561:440 Hz
555:440 Hz
47:scale.
3245:Hertz
2909:speed
2833:Light
2827:Light
2482:WP:NC
2152:Steve
2112:Steve
2079:pitch
2018:Steve
1979:pitch
1935:pitch
1907:pitch
1834:Steve
1727:Steve
1698:Steve
1596:pitch
1319:it.--
1279:300/w
933:Pcb21
878:phase
637:given
532:oldid
528:Sound
509:oldid
28:This
3263:talk
3236:talk
3088:talk
3071:talk
3057:talk
3014:ISBN
2988:talk
2884:and
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