A policeman blows a whistle of frequency 500 hz a car approaches him with a velocity of 15m per
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Here, I have presented the completion of your question along with options and answer.
Your Question:
A policeman blows a whistle of frequency 300Hz as a car speeds past him with a velocity of 18 km/hr .find the change in frequency as heard by the driver of the car just as he passes the policeman. Velocity of sound is 340m/s
Here the change in frequency can be calculated in accordance with the Doppler Effect.
So the answer for your question is 50 Hz.
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