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JEE Main 2022 (Online) 29th June Evening Shift
INTEGER+4 / -12022
In an experiment to determine the velocity of sound in air at room temperature using a resonance tube, the first resonance is observed when the air column has a length of 20.0 cm for a tuning fork of frequency 400 Hz is used. The velocity of the sound at room temperature is 336 ms\(-\)1. The third resonance is observed when the air column has a length of _____________ cm.