Waves - Result Question 32

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32. 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 $1.6 \pi$. The frequency of this wave is

======= ####32. 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 $1.6 \pi$. The frequency of this wave is

3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed:content/english/neet-pyq-chapterwise/physics/waves/waves—result-question-32.md (a) $165 Hz$

(b) $150 Hz$

(c) $660 Hz$

(d) $330 Hz$

[1990]

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Answer:

Correct Answer: 32. (c)

Solution:

  1. (c) From $\Delta x=\frac{\lambda}{2 \pi} \Delta \phi$,

$\lambda=2 \pi \frac{\Delta x}{\Delta \phi}=\frac{2 \pi(0.4)}{1.6 \pi}=0.5 m$

$f=\frac{v}{\lambda}=\frac{330}{0.5}=660 Hz$