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

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A commuter train blows its horn as it passes a

A commuter train blows its horn as it passes a passengerplatform at a constant speed of 40.0m/s. The train horn sounds at a frequency of 305 Hz when the train is at rest.

(a) What is the frequency observed by a person on the platform as the train approaches?

(b) What is the frequency observed by a person on the platform asthe train recedes from him?

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