Describe a simple experiment which demonstrates that the sound produced by a tuning fork is due to vibrations of its arms.
When you strike a tuning fork, it starts vibrating. When this tuning fork is brought near the ear, we hear some sound. When this fork is brought near a hanging ball, the ball starts oscillating.
Strike one arm of a tuning fork on a rubber pad. A sound is emitted from the tuning fork and simultaneously the prongs are seen blurred. This is due to rapid vibrations produced in them.
When this vibrating fork is brought near a suspended ball, it is observed that the ball starts oscillating to and fro.
Thus, a vibrating source is necessary for the production of sound.