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 you (the observer) see a LOWER frequency (a redshift) than what the source is emitting? Choose all that apply.

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

Explanation / Answer

A fire truck is moving away from you while traveling 40 mph. You are stationary
A train is stationary. You are moving away from it while traveling 40 mph
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