Concepts of Physics

IIT JEE Physics (1978-2018: 41 Years) Topic-wise Complete Solutions

Sound is Produced by Vibrations

Objective

To demonstrate that sound is produced by vibrations.

Procedure

Use tape to fix a string to a small plastic ball. Suspend the ball from a support. Now, strike a prong of a tuning fork against a pad, and touch the ball with the prong. The ball will move away with a jerk. This shows that the prongs are vibrating. When they vibrate, they move back and forth. So, when a vibrating prong touches the ball, the ball moves.

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Gently touch the surface of the water kept in vessel with a prong of a tuning fork, after striking it against a pad. Since the prong vibrates, it creates ripple in water.