Question

What produces sound?

• A. Electric current
• B. Friction
• C. Force
• D. Vibration

Answer 1

Answer: (D)

Whenever a body vibrates, it produces sound.

Sound is a type of energy made by vibrations. When an object vibrates, it causes movement in surrounding air molecules. These molecules bump into the molecules close to them, causing them to vibrate as well. This makes them bump into more nearby air molecules.

For example, a school bell rings because the hammer hits the gong and makes it to vibrate. The vibrating gong produces the sound.