A string of length 2m is fixed at two ends. It is in resonance with a tuning fork of frequency 240 Hz in its third harmonic. Then speed of wave sound in string and its fundamental frequency is:

Options

A. 320m/s, 80Hz
B. 180m/s, 120 Hz
C. 320 m/s, 120Hz
D. 180m/s, 80Hz

Answer

A

Explanation

`L = 2.0 m ` `f=240Hz`
`f= (3v)/(2L) = 240 , (3v)/(4) = 240`
`v=320 , f_(0)=(v)/(2L) 80Hz`