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Q.

Calculate the percentage increase in the apparent frequency of sound if an observer is moving towards stationary source of sound having velocity equal to one fifth of the velocity of sound?

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a

5%

b

20%

c

Zero

d

0.5%

answer is B.

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Detailed Solution

By Doppler's effectv′v=ν5+ν0νs (where vs is the velocity of sound)=ν+(ν/5)ν=65∴ Fractional increase=v′−vv=v′v−1=65−1=15∴ Percentage increase =1005=20%
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