Question

What is the speed of sound in vacuum?

• A. $0m{s}^{-1}$
• B. $3\times {10}^{8}m{s}^{-1}$
• C. $250m{s}^{-1}$
• D. $330m{s}^{-1}$

Answer 1

The correct option is A $0m{s}^{-1}$

Sound wave is a mechanical wave which requires a medium for its propagation. It cannot travel through vacuum. Hence, the speed of sound is zero in vacuum.