# Applying the Doppler Effect

An observer at rest notices the frequency of a car horn appears to drop from 306 Hz to 272 Hz as the car passes him. Find the speed of the car. How fast must the observer travel towards the car for the apparent frequency to rise from 306 Hz to 315 Hz?

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The problem is based on Doppler effect. In this problem, you ...

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This solution provides detailed explanations and step-by-step equations for a question that applies the Doppler effect.

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