Question

Explain why sound waves can be described as pressure waves. explain in brief with example.

Answer 1

Sound wave consists of a repeating pattern of high-pressure and low-pressure regions moving through a medium, so it also
described as pressure wave.
If a detector, whether it is the human ear
or man-made instrument, were used to
detect a sound wave, it would detect
fluctuations in pressure as the sound wave
impinges upon the detecting device. At one
instant in time, the detector would detect a high pressure; this would correspond to the arrival of a compression at the detector site. At the next instant in time, the detector m
detect normal pressure. And then finally a
low pressure would be detected, correspond
to the arrival of a rarefaction at the detector site. The fluctuations in pressure as detected by the detector occur at periodic and  
regular time intervals.