Person and a train

A train is moving on a straight track with speed \(20 \text{ ms}^{-1}\). It is blowing its whistle at the frequency of \(1000 \text{ Hz}\). 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 \(320 \text{ ms}^{-1}\)

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