A train whistle ( f 5 400 Hz) sounds higher or lowerin frequency depending on whether it
Chapter 17, Problem 54(choose chapter or problem)
A train whistle ( f 5 400 Hz) sounds higher or lowerin frequency depending on whether it approaches orrecedes. (a) Prove that the difference in frequencybetween the approaching and receding train whistle isDf 52u/v1 2 u2/v2 fwhere u is the speed of the train and v is the speed ofsound. (b) Calculate this difference for a train movingat a speed of 130 km/h. Take the speed of sound in airto be 340 m/s.
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