LETS
PRACTICE
A high speed train is travelling at a speed of 44.7
m/s when the engineer sounds the 415 Hz warning
horn. The speed of the sound is 350 m/s. What is
the frequency as perceived by the listener if:
a. The listener is standing at the crossing when the
train is approaching
b. The listener is in front of the train driving a car
20 m/s on the same direction as the train.
c. The listener is standing when the train is leaving
the crossing.



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