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Q.

An observer moves towards a stationary source of sound with a speed 15th of the speed of sound. The wavelength and frequency of the source emitted are λ and f respectively. What will be the apparent frequency and wavelength recorded by the observer respectively ?

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a

1.2f,1.2λ

b

1.2f,λ

c

f,1.2λ

d

0.8f,0.8λ

answer is B.

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Detailed Solution

Apparent frequency f′=v+v0vff′=v+(1/5)vvf=1⋅2fVelocity of sound relative to the observer =v+v5=6v5⇒λ'f'=v' ⇒λ'6f5=6v5 ⇒λ'=λ.

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An observer moves towards a stationary source of sound with a speed 15th of the speed of sound. The wavelength and frequency of the source emitted are λ and f respectively. What will be the apparent frequency and wavelength recorded by the observer respectively ?