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Question

# An observer is standing 2.040 km away from a source of sound. The velocity of sound in the medium is 340 m s−1. The frequency of the sound is 500 Hz. Calculate the number of oscillations that the sound wave makes before it reaches that person.

A
3000
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B
1000
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C
6000
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D
2000
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Solution

## The correct option is A 3000The distance between the source and the observer, s=2.040 km = 2040 m. The velocity of sound, v=340 ms−1. The frequency of the sound, f=500 Hz. The time taken for the sound wave to reach the observer from the source is, t=sv The number of oscillations in time t will be, n=tf n=svf n=2040×500340 n=3000. Hence, the number of oscillations that the sound makes before it reaches the person would be 3000.

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