Quick practice
Question 1 of 5
A police car with a siren of frequency 8 kHz is moving with uniform velocity 36 km/ hr towands 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
8.25 kHz
B
8.50 kHz
C
7.50 kHz
D
7.75 kHz
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