If you wait at a railroad crossing as a train approaches and passes, you hear a Doppler shift in its sound. But if you listen closely, you hear that the change in frequency is continuous; it does not suddenly go from one high frequency to another low frequency. Instead the frequency smoothly (but rather quickly) changes from high to low as the train passes. Why does this smooth change occur?
If you wait at a railroad crossing as a train approaches and passes, you hear a Doppler shift in its sound. But if you listen closely, you hear that the change in frequency is continuous; it does not suddenly go from one high frequency to another low frequency. Instead the frequency smoothly (but rather quickly) changes from high to low as the train passes. Why does this smooth change occur?
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If you wait at a railroad crossing as a train approaches and
passes, you hear a Doppler shift in its sound. But if you listen closely,
you hear that the change in frequency is continuous; it does not suddenly
go from one high frequency to another low frequency. Instead the
frequency smoothly (but rather quickly) changes from high to low as the
train passes. Why does this smooth change occur?
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