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Apparent frequency and Doppler's effect.

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A person with perfect pitch sits on a bus bench listening to the 444 Hz horn of an approaching car. If the person detects a frequency of 472 Hz, how fast is the car moving?

The answer is not 21.63 m/s, I already tried that in LON CAPA and they rejected it. I have been working on this problem for a while. Please show all work and steps and the final answer.

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Solution Summary

This problem is about using Doppler's effect to find apparent frequency when the source is moving relative to the listener.

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