Solution Q.1.

A sound wave consists of a series of compressions and rarefactions. Which of the following distances is the wavelength of a sound wave?
(a) The distance between a compression and the next rarefaction.
(b) The distance between a compression and the next compression.
(c) The distance between a rarefaction and the next rarefaction.
(d) Both (b) and (c)


Answer: D

A wavelength is the length of one complete wave. This includes both the compression and rarefaction of the wave. Hence the wavelength would be the distance between a compression and the next compression or the distance between a rarefaction and the next rarefaction.


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