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A tuning fork is used to produce re...

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 variavble piston .At room temperature of `27 ^(@) C ` two successive resonances are produced at 20 cm and 73 cm of column lenggth . if the frequency of the tuning fork is 320 Hz , the velocity of sound in air at `27 ^(@)C` is

A

`350 m//s`

B

`339 m//s`

C

`330 m//s`

D

`300 m//s`

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