A tuning fork is used to produce resonance in glass tube. The length of the air column in this tube can be…

A tuning fork is used to produce resonance in glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of 27 oC two successive resonances are produced at 20 cm and 73 cm of column length. If the frequency of the tuning fork is 320 Hz, the velocity of sound in air at 27 oC is
  1. 350 m s-1
  2. 339 m s-1
  3. 330 m s-1
  4. 300 m s-1

Solution

In resonance tube experiment,
Speed of sound v=2fl2-l1
=2320×0.73-0.20
= 640×0.53=339.2 m s-1

Asked in: NEET 2018

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