What is the speed of sound in a vacuum?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 0 m/s
Sound is a mechanical wave: it travels by making the particles of a medium vibrate. A vacuum has no particles to carry the vibrations, so sound cannot travel through a vacuum and its speed there is zero. Figures such as 330 m/s or 332 m/s are the speed of sound in air.