Wave Mechanics Question 639
Velocity of sound waves in air is 330 m/s. For a particular sound wave in air, a path difference of 40 cm is equivalent to phase difference of 1.671 radians. The frequency of this wave is
Options:
A) $ 165Hz $
B) $ 150Hz $
C) $ 60{}^\circ $
D) $ 330,Hz $
Show Answer
Answer:
Correct Answer: C
Solution:
[c] From $ \Delta x=\frac{\lambda }{2\pi }\Delta \phi $,
$ \lambda =2\pi \frac{\Delta x}{\Delta \phi }=\frac{2\pi (0.4)}{1.6\pi }=0.5 $
$ v=\frac{v}{\lambda }=\frac{330}{0.5}=660,m/s $
BETA
