GRE Subject Test: Physics : Doppler Effect

Study concepts, example questions & explanations for GRE Subject Test: Physics

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All GRE Subject Test: Physics Resources

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Example Questions

Example Question #5 : Waves

A car's horn has a frequency of . As the car drives away from you, you hear the horn at a frequency of . What is the speed of the car?

Possible Answers:

Correct answer:

Explanation:

The equation for the Doppler effect with frequency for a moving source is given by:

Where  is the speed of sound,  is the speed of the source,  is the stationary frequency and  is the Doppler frequency. Substituting the known values and solving gives us the speed of the car.

All GRE Subject Test: Physics Resources

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