Q .     In a resonance tube experiment the length of an air column is `1m` and it vibrates with a tuning fork of frequency `n'`. If it is to vibrate with a frequency `'\frac{4}{3}n'`, increase in height of water in the tube must be ________.

MHCET 2013
A

`25 cm`

B

`50 cm`

C

`75 cm`

D

`100 cm`

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