Waves

A tunning 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 )

Integer / Numeric Answer Type

Enter your answer as a number (integer or decimal).