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The driver of a car travelling with speed `30ms^-1` towards a hill sounds a horn of frequency 600 Hz. If the velocity of sound in air is `330ms^-1`, the frequency of reflected sound as heard by driver is

A

500 Hz

B

550Hz

C

555.5Hz

D

720 Hz

Text Solution

Verified by Experts

The correct Answer is:
D
`n'=v((c+u)/(c-u))`
`=600((330+30)/(330-30))=720Hz`
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