Question

All sound waves are caused by vibrations.

• A. True
• B. False

Answer 1

The correct option is A True

1. Sound is a mechanical wave.
2. Therefore, sound can travel through solid, liquid, and gas but not through a vacuum.
3. When the source of a sound vibrates, it bumps into its nearby molecules and sets them in vibration.
4. These vibrating molecules bump into other neighboring molecules and set them in vibration and so forth.
5. This forms a wave of vibration that travels through solid, liquid, or gas and then reaches the eardrum.

Hence, the given statement is true.