JEE Main 28 June 2022 Shift 2 Solved Paper

A tunning fork of frequency 340‌Hz resonates in the fundamental mode with an air column of length 125‌cm 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 340ms−1 )