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 platform at a constant speed of 55 meter per second. The train horn sounds at a frequency of 340 Hertz when the train is at rest.

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

__________Hz

(b) Find the frequency observed by a person on the platform as the train recedes from him?

__________Hz

__________m

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

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