A commuter train blows its horn as it passes a passenger
Chapter 14, Problem 14.56(choose chapter or problem)
A commuter train blows its horn as it passes a passenger platform at a constant speed of 40.0 m/s. The horn sounds at a frequency of 320 Hz when the train is at rest. What is the frequency observed by a person on the platform (a) as the train approaches and (b) as the train recedes from him? (c) What wavelength does the observer nd in each case?
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