# Frequency physics homework

A man standing by a rail track, hears the whistle of a train at a frequency of 10419.7 Hertz. The train is moving towards the man at a speed of 39.9 meters/sec. The frequency of the whistle (in Hertz) is

Student response 9207.612

frequency heard by the man = [1/(1-[u/v])} * frequency of whistle
u=39.9 m/s
v=343 m/s
frequency heard by the man=10419.7
so, the frequency of the whistle is 9207.612 but the correct answer is 9164.147

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Andrew Mason
Homework Helper
buffgilville said:
A man standing by a rail track, hears the whistle of a train at a frequency of 10419.7 Hertz. The train is moving towards the man at a speed of 39.9 meters/sec. The frequency of the whistle (in Hertz) is

Student response 9207.612

frequency heard by the man = [1/(1-[u/v])} * frequency of whistle
u=39.9 m/s
v=343 m/s
frequency heard by the man=10419.7
so, the frequency of the whistle is 9207.612 but the correct answer is 9164.147