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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 - jee main 2012 physics

 (A) 8.50 kHz 
(B) 8.25 kHz 
(C) 7.75 kHz 
(D) 7.50 kHz



By:milan-ransingh

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pankaj

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