A metra train is moving at a speed of 250 ms as it, Ask an Expert

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A Metra train is moving at a speed of 25.0 m/s. As it approaches astation its horn emits a sound of frequency 750. Hz.

a) Calculate the frequency detected by a personstanding still at the station. (Use 345 m/s for the speed ofsound.)

b) As the train moves away, still blowing its horn at the samefrequency as before, the observer hears a frequency of 717 Hz.Calculate the speed of the train.

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