A tuning fork is used to produce resonance in glass tuve. The length of the air column in the tube can be adjusted by a variable piston. At room temperature of `27^@C` two succesive 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

Options

A. `350 m/s`
B. `300 m/s`
C. `339 m/s`
D. `330 m/s`

Answer

C

Explanation

`v = 2 f (l_(2) - l_(2))`
`= 2 xx 320 (73 - 20) xx 10^(-2)`
`~= 339 m//s`