Waves Ques 57
57. Two sound waves with wavelengths $5.0 $ $m$ and $5.5 $ $m$ respectively, each propagate in a gas with velocity $330 $ $m / s$. We expect the following number of beats per second
[2006]
(a) $0$
(b) $1$
(c) $6$
(d) $12$
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Answer:
Correct Answer: 57.(c)
Solution:
- (c) Frequencies of sound waves are $\frac{330}{5}$ and $\frac{330}{5.5}$
i.e., $66 $ $Hz$ and $60$ $ Hz$
Frequency of beat $=66-60=6$ per second
Beat frequency is the number of beats produced per second.
$ n=n_1 \sim n_2 $
BETA
