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An express commuter train blows its 220-Hz horn as it passes the train stop with 30 MPH speed. What frequency does the observer receive waiting

An express commuter train blows its 220-Hz horn as it passes the train stop with 30 MPH speed. What frequency does the observer receive waiting at the train-stop while approaching and while departing given speed of sound 343 m/s. Explain the frequency shift due to relative speed in few sentences

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