Answer:
A sound wave is produced when an object vibrates.
Explanation:
-The vibrating body moves in one direction and compresses the air directly in front of it.
-As the vibrating body moves in the opposite direction, the pressure on the air is lessened so that an expansion, or rarefaction, of air molecules occurs.
A vibrating object produces sound waves. Energy needs to be transferred from the vibrating object to the ear through a medium. Therefore, both energy and a vibrating object are needed for people to hear a sound wave.
