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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 emited are `lamda` and f, respectively. The apparent frequency and wavelength recorded by the observer are, respectively-
(a) `f,1.2 lambda` (b) `0.8f,0.8lambda` (c) `1.2f,1.2lambda` (d) `1.2f,lambda`

A

`1.2f, 1.2lambda`

B

`1.2f, lambda`

C

`f, 1.2lambda`

D

`0.8f, 0.8lambda`

Text Solution

Verified by Experts

The correct Answer is:
B
Source of stationary `rArr lambda`= constant & `f'=(v+v_s)/v f =(1+v_s/v)f=(1+1/5)f=1.2f`
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