A police car is chasing a motorcyclist at a velocity of 20m/s. velocity of motor cyclist is 15m/s. Wind is blowing from the police car towards the motor cyclist with a velocity of 30m/s velocity of sound in still air is 330m/s. If the motor cyclist blows horn of frequency 400Hz, The apparent frequency of sound received by the police car is

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answer is 3.

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Detailed Solution

Apparent frequency f=f01+vmvs−vw1+vpvs−vw∴f=4001+15330−301+20330−30Hz=400×315320Hz=393.75Hz

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