A vibrating tuning fork is placed over the mouth of a burette filled with water. The tap is opened and the water level gradually falls. It is observed that the sound becomes the loudest for a particular length of the air column.

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Solution

The frequency of the vibrating tuning fork becomes equal to the frequency of the vibration air column.
As the resulting amplitude of the sound produced increases.
Since loudness is proportional to the square of amplitude so sound is loudest

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In Fig. 7.15, A, B, C and D represent the test tubes each of height 20 cm which are filled with water up to heights of 12 cm, 14 cm, 16 cm and 18 cm respectively. If a vibrating tuning fork is placed over the mouth of test tube D, a loud sound is heard.

(a) Describe the observations with the tubes A, B and C when the vibrating tuning fork is placed over the mounth of these tubes.

(b) Give the reason for your observation in each tube.

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.

Name the phenomenon taking place when this happens.

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