Armed with highly sensitive detection equipment, you are in the front of a railroad carthat is accelerating forward. Your friend atthe rear of the car shines green light towardyou. Do you find the light to be red-shifted (low-ered in frequency), blue-shifted (increased infrequency), or neither? Explain. (Hint: Think in terms of the principle of equivalence. What is your accelerating railroad car equivalent to?
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