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A source of sound S is moving with a vel...

A source of sound S is moving with a velocity of `50m//s` towards a stationary observer. The observer measures the frequency of the source as 1000 Hz. What will be the apparent frequency of the source as 1000 Hz. What will be the apparent frequency of the source when it is moving away from the observer after crossing him? The velocity of the sound in the medium is `350m//s`

A

857 Hz

B

807 Hz

C

1143 Hz

D

750 Hz

Text Solution

Verified by Experts

The correct Answer is:
D
`f_1=(v/(v-v_s))f" "..(i)`
`f_2=(v/(v-v_s))f" "..(ii)`
By eq. (i) & (ii)
`f_(1)/(f_2) = ((v+v_s)/(v-v_s)) =((350 +50)/(350 -50))`
`implies (1000)/(f_2) =(400)/300 = f_2 = 750 Hz`
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