A tuning fork of frequency $340\,Hz$ resonates in the fundamental mode with an air column of length $125\,cm$ in a cylindrical tube closed at one end. When water is slowly poured in it, the minimum height of water required for observing resonance once again is________ $cm$
(Velocity of sound in air is $340\,ms ^{-1}$ )
JEE MAIN 2022, Diffcult
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