Waves - Result Question 59

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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

======= ####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

3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed:content/english/neet-pyq-chapterwise/physics/waves/waves—result-question-59.md (a) 0

(b) 1

(c) 6

(d) 12

[2006]

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Answer:

Correct Answer: 61. (c)

Solution:

  1. (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 $