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 particular length of air column:

Q. 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 particular length of air column:
(i) What is the name of the phenomenon taking place when this happens?
(ii) Why does the sound become the loudest?
(iii) How does the frequency of the loud sound compare with that of the tuning fork?
(iv) State the unit for measuring loudness.
Ans. (i) The phenomenon is called resonance.
(ii) The sound becomes loudest because, the natural frequency of the length of air column becomes equal to the frequency of the vibrating tuning fork.
(iii) Frequency of the loud sound is either equal to or odd integral multiple of the frequency of tuning fork.
(iv) Decibel.

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