Question

Select One Correct Option from the following: A police car with a siren of frequency 8 kHz is moving with uniform velocity 36 km/h towards a tall building which reflect 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

Answer 1

b is correct.
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Answer 2

Select One Correct Option from the following: A police car with a siren of frequency 8 kHz is moving with uniform velocity 36 km/h towards a tall building which reflect 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