Wave Mechanics Beats Question 38
Question: Two sound waves of wavelengths 5m and 6m formed 30 beats in 3 seconds. The velocity of sound is
[EAMCET 2001]
Options:
A) 300 ms?1
B) 310 ms?1
C) 320 ms?1
D) 330 ms?1
Show Answer
Answer:
Correct Answer: A
Solution:
No of beats, x = $ \Delta n=\frac{30}{3}=10Hz $
Therefore Also $ \Delta n=v[ \frac{1}{{\lambda _{1}}}-\frac{1}{{\lambda _{2}}} ]=v[ \frac{1}{5}-\frac{1}{6} ] $ =10
Therefore $ v=300 $ m/s
BETA
