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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?
(c) Find what wavelength does the observer find in each case?
__________m
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