Question

In the given diagram, a vibrating tuning fork is kept near the mouth of a burette filled with water. The length of the air column is adjusted by opening the tap of the burette. At a length of 5 cm of the air column, a loud sound is heard

1. Name the phenomenon illustrated by the above experiment.
2. Why is a loud sound heard at this particular length?
3. If the present tuning fork is replaced with a tuning fork of higher frequency, should the length of the air column increase or decrease to produce a loud sound? Give a reason.

Answer 1

1. Resonance
2. The loud sound is audible at this specific length because the tuning fork's frequency and the air column's frequency are equal. 

3. Since, `fprop1/l`

   Therefore, in order to create a loud sound, the length of the air column should decrease as the frequency increases.