A tuning fork is used to produce resonan...

A tuning fork is used to produce resonance in glass tube. The length of the air column in the tube can be adjusted by a variable piston. At room temperature of `27^@C` two successive resonance are produced at 20 cm and 73 cm column length. If the frequency of the tuning fork is 320 Hz. the velocity of sound is air at `27^(@)C` is

`300 m//s`

`330 m//s`

`350m//s`

`339m//s`

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