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 )
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(50)
Assumption: Ignore word "fundamental mode" in question.

First resonating length =
= 25 cm
Second resonating length =
= 75 cm
Third resonating length =
= 125 cm
Height of water required = 125 - 75 = 50 cm
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