Question

A vibrating tuning fork is placed over the mouth of a burette filled with water. The tap of the burette is opened and the water level gradually starts falling. it is found that the sound from the tuning fork Becomes very loud for a particular length of the water column.

Why does the sound become very loud for this length of the water column?

Answer 1

1. When the frequency of the air column becomes equal to the frequency of the tuning fork resonance occurs.
2. The amplitude of the sound is maximum when resonance occurs.
3. The loudness of sound depends on the amplitude if the amplitude is maximum then the sound is very loud.
4. Hence, the given case vibrations of the air column are in resonance with the forks, and a loud sound is heard.