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The driver of a car treavelling with speed `30 ms ^(-1)` toward a hill sounds a horn of frequenvy 600 Hz. If the velocity of sound in air is `300ms^(-1)` the frequency of reflected sound as heard by diver is

A

500 Hz

B

550 Hz

C

555.5 Hz

D

720 Hz

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The correct Answer is:
D
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