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Question

A sound wave of frequency 100 Hz is travelling in air. The speed of sound in air is 350 m s1. By how much is the phase changed at a given point in 2.5 ms?

A

π

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B

3π5

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C

π2

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D

0.2 π

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Solution

The correct option is C

π2


The change in phase is given by ωt, ΔΦ

=2πft=2π×100×2.5×103

=π2


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