Provided the amplitude is sufficiently great the human ear

Question

The following is a standard problem found in many textbooks:

Problem: 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.

Part 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,

Part I: How far apart would the red dots be?

m

Part II: How far apart would the blue dots be?

cm

Part b: In reality would adjacent dots in each set be far enough apart for you to easily measure their separation with a meter stick?

Yes/No

Part c: Suppose you repeated part (a) in water, where sound travels at 1480 m/s.

Part I: How far apart would the red dots be?

m

Part II: How far apart would the blue dots be?

cm

Part III: Could you readily measure their separation with a meter stick?

Yes/No

I need expert help to solve the above problem.