What was the wavelength in the frame it was emitted

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Reference no: EM13995459

A. You are in a spaceship travelling at 0.99c. You notice something green (λ= 520nm) in your window. If it is a forward facing mirror, what was the wavelength in the frame it was emitted?

B. What would the answer to part A be if you saw this light out of a rear facing window?

Reference no: EM13995459

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