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A car moving with a velocity of 36 km/h ...

A car moving with a velocity of 36 km/h crosses a siren of frequency 500 Hz. The apparent frequency of siren after passing it will be

A

530 Hz

B

485 Hz

C

540 Hz

D

460 Hz

Text Solution

Verified by Experts

The correct Answer is:
B
Velocity of the car `=(36000 m)/(3600 s) = 10 m//s`
`v_("emitted") = 500 Hz, v_("sound") = 330 m//s`
`v_("obs") =v_("emitted") xx (v_("sound" -v_("obs"))/v_("sound"))`
Observed frequency `v_("obs") = 500 xx ((330-10)/330)`
`rArr v_("obs") = 484 Hz`
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