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Question

If the speed of sound in air is 332 m/s, then its speed in vacuum

A
>332 m/s
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B
=332 m/s
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C
<332 m/s
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D
Does not propagate in vacuum
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Solution

The correct option is D Does not propagate in vacuum
We know that sound is a Longitudinal and mechanical wave.

A Mechanical wave requires medium to propagate.

Since, in vacuum , there is complete absence of particles of matter and has no physical properties , a Mechanical and longitudinal wave cannot propagate.

Thus, speed of sound in vacuum is meaningless and cannot be determined.

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