A commuter train blows its horn as it passes a passenger, Physics

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A commuter train blows its horn as it passes a passenger

A commuter train blows its horn as it passes a passenger platformat a constant speed of 30.0 m/s. The trainhorn sounds at a frequency of 330 Hz whenthe train is at rest.

a) What is the frequency observed by a personon the platform as the train approaches?
b) What is the frequency observed by a person on the platform asthe train recedes from him?
c) What wavelength does the observer find in each case?

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