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Question

In sound wave, Vw is the wave velocity and Vp is particle velocity. Then:

A
Vw || Vp
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B
VwVp
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C
Vw×Vp=0
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D
Vw.Vp=0
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Solution

The correct option is C Vw×Vp=0
Sound wave is a longitudinal wave in which direction of both particle velocity and wave velocity are parallel.

i.e Vw || Vp

Vw×Vp=VwVpsin0=0

and Vw.Vp=VpVwcos00

Hence, option (a) and (c) are correct.

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