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A police car with a siren of frequency 8 kHz is moving with uniform velocity 36 km/h toward a tall building which reflects the sound waves.

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A police car with a siren of frequency 8 kHz is moving with uniform velocity 36 km/h toward a tall building which reflects the sound waves. The speed of sound in air is 320m/s. The frequency of the siren 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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Correct option   (A) 8.50 kHz

Explanation:

 36 km/h = 36 × 5/18 = 10 m/s

Apparent frequency of sound heard by car driver (observer) reflected from the building will be 

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