Question

The following diagram shows an experiment using a beaker of large height and a pipe. [Excited tuning fork is used]

(a) What happens to the loudness of the sound produced by the tuning fork while adjusting the height of air column inside the pipe ?

(b) What will be the natural frequency of air column at the time of hearing the loud sound if the frequency of given tuning fork is 512 Hz ? Explain the phenomena behind this loudness.

Answer 1

(a) Loudness of the sound decrease as the height of the air column is increased and vice versa.

(b) Frequency of tuning fork is 512 Hz. If a tuning fork vibrating at this known frequency is held over the open end of the hollow tube, and the height of air column is increased., then there will be a marked increase in loudness of sound at some position. At this position the air column is set into the same frequency as that of the tuning fork i. e. 512 Hz in this case. In other words, they all are in resonance.