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 for the resonance ... $cm$ ? (speed of sound in air $= 340\, m/s$)
  • A$45$
  • B$30$
  • C$40$
  • D$25$
AIIMS 2009, Medium
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