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Q. In a long cylindrical tube, the water level is adjusted and the air column above it is made to vibrate in unison with a vibrating tuning fork kept at the open end. Maximum sound is heard when the air column lengths are equal to :

NTA AbhyasNTA Abhyas 2020

Solution:

Solution
Resonance takes place when
$\ell =\frac{\lambda }{4}$
$\ell =\frac{3 \lambda }{4}$
$\ell =\frac{5 \lambda }{4}$