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A light-rail commuter train blows its 200 Hz horn as it approaches a crossing. The speed...

A light-rail commuter train blows its 200 Hz horn as it approaches a crossing. The speed of sound is 341 m/s.

(a) An observer waiting at the crossing receives a frequency of 213 Hz. What is the speed of the train? ____m/s

(b) What frequency does the observer receive as the train moves away? ____Hz

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