Question

Sound waves cannot travel in a vacuum. It can travel only through a material medium. e.g., solids, liquids and gases. An echo is heard after 0.8 s when a person fires a cracker 130 m from a high building:

(ii) Why sound cannot travel through a vacuum?

Answer 1

1. A sound wave is a form of energy that flows from one point to another.
2. This flow of energy is in the form of waves.
3. Sound is a form of a mechanical wave which requires a medium to travel.
4. Thus, Sound cannot travel in a vacuum because the sound is a mechanical wave.