In the following situations a light is being directed towards you by the object

Question

In the following situations a light is being directed towards you by the object described. In which of the following will there be a Doppler Effect? Choose all that apply.


A. A police car is stationary. You are moving towards it while traveling 40 mph.
B. A fire truck is moving towards you while traveling 40 mph. You are stationary.
C. An ambulance is circling you. You are stationary.
D. A train is moving away from you while traveling 50 mph. You are stationary.
E. A flying saucer is moving away from you while traveling 50 ft/min. You are moving away from it while traveling 50 ft/min.

Explanation / Answer

A police car is moving away from you while traveling 40 mph. You are stationary. An ambulance is stationary. You are moving towards it while traveling 40 mph. A train is moving towards you while traveling 50 mph. You are stationary. A flying saucer is stationary. You are moving away from it while traveling 50 ft/min.

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