Question

If the speed of sound in air is $332\text{m/s}$, then its speed in vacuum

• A. $>332\text{m/s}$
• B. $=332\text{m/s}$
• C. $<332\text{m/s}$
• D. Does not propagate in vacuum

Answer 1

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.