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A laser at rest is emitting photons at 400 nm (what color is this?) If we...

A laser at rest is emitting photons at 400 nm (what color is this?) If we observe the same laser moving away from us at one-fourth the speed of light, what color light will we see coming out of the laser?
Bonus: Is this a good approximation for these kinds of velocities? See Doppler effect slides.

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