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NEET 2018, Physics Q25: Stationary Waves in Air Column

NEET2018Paper 2018Physics
Q.

A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of 27ºC 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 27ºC is

  1. A

    330 m/s

  2. B

    350 m/s

  3. C

    339 m/s

  4. D

    300 m/s

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