Originally posted by Duncan
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A longitudinal wave has a wavelength. Wavelength is the distance between any one point and the same point in the next repeating cycle. That is the length of the full wave, or one whole cycle.
If a longitudinal wave didn't have wavelength and frequency then there would be no such thing as music as it would be impossible to play any pitch (frequency).
A sine wave can be representative of anything. It's a value that changes over time.
A picture of a sine wave represents a longitudinal wave just as well as it represents a transverse wave. The compression and rarefaction zones are distributed as a sine wave.



A longitudinal wave can be sine or anything else, which is how it's possible to produce different sounds.
If you press a button softly and increase the pressure gradually before easing off the pressure again, the pattern it produces when pressure vs time is plotted on a graph is a sine wave. Switch the button on and off and the graph gives you a square wave. Vary it in any given fashion and you produce all kinds of waveforms. Value over time.
acoustics - How can a sine wave represent a longitudinal wave? - Physics Stack Exchange
AT&T Archives: Similiarities of Wave Behavior (Bonus Edition) - YouTube
Sine waves have nothing to do with propagating through space while still looking like a sine wave. It's a visual representation of how the value of some variable changes over time.
. Wavelength is the unit of the electromagnetic wave. It certainly isn't the unit of the longitudinal wave . although it may be said to have a period. As I'm asking you to consider the electrical (equivalent) affects of this wave after what you may consider the (equivalent) of demodulation it is essential that you grasp the nature of it.

don't know if they are posted anywhere

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