Question no. C

c.  A vibrating tuning fork is placed over the mouth of a burette filled with water. The tap is opened and water level gradually falls. It is observed that sound becomes the loudest for particular length of air column. 
(i) Name the phenomenon occuring.
(ii) When does the sound become the loudest ? 
(iii) Name the phenomenon occuring when sound produced is not the loudest. 

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