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A train is approaching a signal tower at a speed of 40 m/s. The train engineer sounds the 1000 Hz whistle and a switchman in

  1. A train is approaching a signal tower at a speed of 40 m/s. The train engineer sounds the 1000 Hz whistle and a switchman in the tower responds by sounding the 1200 Hz siren. The air is still and the speed of sound is 340 m/s. What is the frequency of the train whistle tone, heard by the switchman? What is the frequency of the tower siren tone, heard by the engineer?

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