Question

Velocity of sound wave in air is 330 m/s for a particular sound in air.A path difference of 40 cm is equivalent to a phase difference of 1.6 `pi.` The frewuency of this wave is
A. 165 Hz
B. 150 Hz
C. 660 Hz
D. 330 Hz

Answer 1

Correct Answer - C
As, phase difference `=(2pi)/(lamda)xx` path difference
`rArr" "1.6pi = (2pi)/(lamda)xx40rArrlamda=50cm=0.5m`
Now, as `" "v=lamdaf rArrf=v/(lamda)=(330)/(0.5)=660Hz`