Sound WavesEasy

Question

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

Options

A.8.50 kHz
B.8.25 kHz
C.7.75 kHz
D.7.50 kHz

Solution

f =
⇒ f′ =
⇒ f′ ≈ 8.50 kHz

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