A locomotive moving at 30.0 m/s approaches and passes a person standing beside the track. Its whistle

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A locomotive moving at 30.0 m/s approaches and passes a person standing beside the track. Its whistle is emitting a note of frequency 2.00 kHz. What frequency will the person hear 

(a) As the train approaches and 

(b) As it recedes? The speed of sound 340 m/s.

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