Waves - Result Question 59
61. 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
(a) 0
(b) 1
(c) 6
(d) 12
[2006]
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Answer:
Correct Answer: 61. (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 $
