Person and a train

A train is moving on a straight track with speed 20 ms 1 20 \text{ ms}^{-1} . It is blowing its whistle at the frequency of 1000 Hz 1000 \text{ Hz} . What is the percentage change in the frequency heard by a person standing near the track as the train passes him?

Details and assumptions

  • Speed of sound is 320 ms 1 320 \text{ ms}^{-1}
24 % 24\% 6 % 6\% 18 % 18\% 12 % 12\%

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