All Questions
377
questions
0
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1
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44
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What is the frequency of a standing wave? [closed]
I understand that constructive interference of waves results in standing waves. And for a wire with both ends fixed the frequency should match the fundamental frequency of the wire to produce standing ...
- 91
0
votes
1
answer
49
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What is the mathematical support for the formula $f_n = n f_1$, used to calculate the frequency of a standing wave? [closed]
could someone explain to me the mathematical support for the formula $f_n = n f_1$. This formula refers to the fact that the frequency of a standing wave is equal to the number of antinodes times the ...
-1
votes
0
answers
19
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Doppler effect for multiple sources [closed]
Given the figure below, how can I determine the speed from the two sources given that they both produce a frequency of 1000 Hz, and the speed of sound can be assumed to 340 m/s. The sources are both ...
- 1
3
votes
2
answers
174
views
Angular frequency vector, when explaining the motion of a wave
The wave number $|k|$ results as the magnitude of the wave vector $k$. Is there an analogous vector from which the angular frequency $\omega$ results when the magnitude is formed? If yes, how can you ...
- 35
0
votes
2
answers
84
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I don't understand intuitively why the instantaneous frequency is obtained by calculating the time derivative of the phase
I don't understand intuitively why the instantaneous frequency is obtained by calculating the time derivative of the phase
- 11
0
votes
0
answers
75
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Who wrote $c = λ ν$ for the first time and where can I find it?
I have been surfing for days and still I could not find who wrote the equation $c=λν$ for the first time. Neither I found a name for this equation. A lot about Planck's constant and energy related ...
3
votes
0
answers
85
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Why do water surfaces have persistent "average wavelength" patches?
Have you ever stood above a river or lake and noticed that the surface has visible "patches"? It looks like the surface has different average wavelengths in some areas, leading to the light ...
- 131
1
vote
1
answer
38
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How to standardize the energy of a Dirac delta function relative to sample rate (width) and amplitude?
Background
I was instructed that a Dirac delta function (impulse from $0$ to $A$ then back to $0$ at short duration) has a white noise audio frequency type excitation distribution here
ie. It should ...
- 321
1
vote
2
answers
47
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Is it possible to, like white noise, excite all audio frequencies equally, but with a more immediate & less random burst? Like a signal discontinuity?
I am trying to generate an audio signal that, like white noise, has "equal intensity at different frequencies, giving it a constant power spectral density", but unlike white noise, can be ...
- 321
1
vote
0
answers
34
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Why doesn't frequency change when the medium of the wave changes, and only depend on the source of the wave? [duplicate]
When the medium of the wave changes, the velocity and the wavelength does change, but not frequency, why?
- 53
0
votes
1
answer
82
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Do humans hear the beat frequency or the average frequency or just individual frequencies?
We have two sound sources of the same amplitude but of slightly different frequencies : $f_1$ and $f_2$. When they are sounded simultaneously what would be the frequency that an observer hears ?
I ...
- 107
0
votes
3
answers
144
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Why does the equation of a wave contain the term $\omega t$ instead of $vt$ in the wave equation $y=A\sin (kx-\omega t)$?
Why does the equation of a wave contain the term $\omega t$ instead of $vt$ in the wave equation
$$y=A\sin (kx-\omega t).$$
I think of the constant $k$ which for higher values increases the frequency $...
- 87
1
vote
4
answers
209
views
$0$th overtone in closed organ pipes
I know about $1$st, $2$nd or other overtones in the formula of frequency in a one-sided open system (specifically in closed organ pipes) that is
$$ f = \frac{\left( 2 n + 1 \right) v}{4 L} \tag{1} \...
- 23
0
votes
1
answer
56
views
Generally speaking, the speed of a wave depends on the medium and the wave type, so waves of the same type in the same medium attain the same speed [duplicate]
My question is, given the above statement, why electromagnetic waves attain different speeds in media other than vacuum even though they are of the same type and propagate in the same medium?
- 959
2
votes
0
answers
58
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How do lower frequencies change differently than higher ones as they travel?
I read the following on the internet:
"This means that as sound travels, its relative frequency content alters making the low frequencies more prominent at greater distances, creating low ...
- 131