A tuning fork of frequency 340 Hz is vibrated just above the tube of 120 cm height- Water is poured slowly in the tube- What is the minimum height of water necessary the resonance- -speed of sound in air - 340 m-s-45 cm30 cm40 cm25 cm

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A tuning fork of frequency 340Hz is vibrated just above the tube of 120cm height. Water is poured slowly in the tube. What is the minimum height of water necessary for the resonance? (speed of sound in air =340m/s)45cm30cm40cm25cm

A tuning fork of frequency $340 H z$ is vibrated just above the tube of $120 c m$ height. Water is poured slowly in the tube. What is the minimum height of water necessary for the resonance? $($ speed of sound in air $= 340 m / s)$
$45 c m$
$30 c m$
$40 c m$
$25 c m$