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An observer moves towards a stationary s...

An observer moves towards a stationary source of sound with a speed `1//5^(th)` of the speed of sound. The wavelength and frequency of the source emitted are X and f respectively. The apparent frequency and wavelength recorded by the observer are respectively

A

` 1.2f .lambda `

B

` f,1.2lambda `

C

` 0.8,f,0.8 lambda `

D

` 1.2f ,1.2 lambda `

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The correct Answer is:
A
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