A train whistle 2000 Hz sounds higher or lower in frequency depending on whether it approaches or recedes the observer. The difference between the two will be heard at the moment the train passes the observer. Calculate this difference for a train moving at a speed of 180 km/h. Take the speed of sound in air to be 330 m/s. State answer in hertz to the newest tenth of a hertz

A train whistle 2000 Hz sounds higher or lower in frequency depending on whether it approaches or recedes the observer. The difference between the two will be heard at the moment the train passes the observer. Calculate this difference for a train moving at a speed of 180 km/h. Take the speed of sound in air to be 330 m/s. State answer in hertz to the newest tenth of a hertz

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