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2

When a mass-spring system moves, kinetic energy is 'stored' as momentum in the moving mass which is then converted to potential energy in the compression of a spring and back to kinetic energy as the spring extends, moving the mass back again. This periodic conversion of energy from kinetic to potential and back again is known as 'resonance' and occurs at a ...


2

By superposition principle we will arrive at, $$y_{total} = {[ 2Acos(2\pi \Delta f/2) ]cos(2\pi f_{av})} $$ The term inside the [] brackets can be considered as the slowly varying function that modulates the carrier wave with frequency $f_{av}$. (It is indeed an example of amplitude modulation or AM.) This function--the modulation of the amplitude--is the ...


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I believe the premise of the question is incorrect. If the speakers are connected in the manner specified, the sound waves for all frequencies will be out of phase, as observed at the surface of each of the speaker cones. If a single observer is located equidistant from the two speakers, he/she will also observe destructive interference for all ...


2

The beat frequency is very simply: $$f_{beat}=|f_1-f_2|$$ So there is no limit on how far apart they can be. In demonstrating the beat frequency one frequently uses frequencies that are slightly apart because it produces the typical "beating." If for example you were using the frequencies $561.6$ Hz and $300$ Hz you would get a resulting frequency of ...


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the general modern consensus is that sound does not have polarization possible due to lack of shear forces in air required for transverse wave propagation. however here is an old forgotten study that reports measuring a weak effect by a professor of physics at Ohio State university and published in Science magazine. wonder if there is any more modern ...


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Bass sound-waves are really big. The lower the bass, the bigger the wave. A single wavelength can go through a window, or door and enter back in through another window in a different room. They can go around walls and corners. They can also create resonance with large objects like walls, and this helps them to pass through because the wall is ...


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In simple words, you cant hear the person outside shouting because the sound waves generated by the noises in close proximity to you are more dominant and so you tend to hear them more.Also, they hear you clearly because of the assumed lack of noise outside the door.


3

It is not amplification! The purpose of the guitar body is to impedance and mode match between the string and the surrounding air. Intuition When a an object vibrates it pushes on the surrounding air creating pressure waves which we hear as sound. A string vibrating alone without the body of the instrument doesn't make a very loud sound because exchange of ...


10

You describe "a whistle sound when air is pushed through a tight space". That is a familiar phenomenon. Essentially, you hear a self-sustaining resonance - something is driving the air mass in a way that causes a resonance that becomes a recognizable pitch. When air flows rapidly around a tight opening / sharp lip, you get flow with a very high Reynolds ...


2

As a physics & music major I've thought about this a lot. Our visible light range doesn't even cover one octave (400nm - 700nm), but you can see how 400nm light (violet) almost completes the octave from 700nm light (red). Perhaps if we could see 350nm light we'd perceive it similarly to red? I think there's an evolutionary advantage to our eyes not ...


1

Sadly, there is no relation. While at least some chords have a nice physical basis - octaves are literally harmonics of each other - human perception of color has very little connection to the physics of light. Color is cyclical: we see high-frequency blues as near low-frequency reds with mixed-frequency purples in between, so there is no equivalent of an ...


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You need to measure the sound level in decibels. This is a logarithmic scale where zero decibels corresponds to a root mean square pressure of 20 micropascals, and every 20 decibels corresponds to a tenfold increase in the pressure. Once you have measured the sound level and calculated the pressure you can use the equation for the particle velocity: $$ v = ...


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For general audio programming or playback, 96kHz or 192hHz is simply useless. Indeed, the Nyquist theorem tells you that a signal can be exactly reproduced given that the sample rate is greater than the highest frequency contained in the original signal. The "excuse" of the slope of analog filter required after digital to analog conversion is no longer ...


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because the higher the sampling rate is the sloppier the (annalogue) filtering preceding the sampler can be to reduce the aliased noise/interference



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