Audible Sound Provided The Amplitude Is Sufficiently Great The Human

Audible Sound provided the amplitude is sufficiently great, the human ear can respond to longitudinal waves over a range of frequencies from about 20.0 Hz to about 20.0 kHz.
(a) If you were to mark the beginning of each complete wave pattern with a red dot for the long-wavelength sound and a blue dot for the short-wavelength sound, bow far apart would the red dots be, and how far apart would the blue dots be?
(b) In reality would adjacent dots in each set be far enough apart for you to easily measure their separation with a meter stick?
(c) Suppose you repeated part (a) in water, where sound travels at 1480 m/s. How far apart would the dots be in each set? Could you readily measure their separation with a meterstick?

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