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A vibrating tuning fork is placed over t...

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 lenght of the water column?

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At a certain length of water column and air column (above water), the frequency of air column and the frequency of tuning fork becomes equal, resonance occurs, amplitude increases hence loud sound is heard.
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