vs = velocity of the source relative to the medium - positive if the source is moving away from the receiver (m/s)
A train with speed 200 km/h (55.6 m/s) passes a bell with sound frequency 1000 Hz. With an air temperature of 20 oC the speed of sound is 343 m/s.
The frequency observed by a passenger in the train before passing the bell can be calculated as
fr = (1000 Hz)((343 m/s) + (55.6 m/s)) / ((343 m/s) + (0 m/s))
= 1162 Hz
The frequency observed by the passenger in the train after passing the bell can be calculated as
fr = (1000 Hz) ((343 m/s) + (- 55.6 m/s)) / ((343 m/s) + (0 m/s))
= 838 Hz
Calculate the observed frequency with the calculator below:
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