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A police car with a siren of frequency 8...

A police car with a siren of frequency 8 kHz is moving with uniform velocity `36 km//hr` towards a tall building which reflects the sound waves. The speed of sound in air is `320 m//s`. The frequency of the siren heard by the car driver is

A

8.50 kHz

B

8.25 kHz

C

7.75 kHz

D

7.50 kHz

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TARGET PUBLICATION-Sound-Exercise
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