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What is the frequency of the train whistle tone heard by

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.

a. What is the frequency of the train whistle tone, heard by the switchman, in SI units?

b. What is the frequency of the tower siren tone, heard by the engineer, in SI units?

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