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

Answer

B

Explanation

`v=2f(l_(2)-l_(1))`
`=2(320)xx(0.73-0.20)=(640)xx(0.5)=339.2m//s`