A spaceship is moving away from Earth at speed 0.20c. A source on the rear of the ship
Chapter 37, Problem 39(choose chapter or problem)
A spaceship is moving away from Earth at speed 0.20c. A source on the rear of the ship emits light at wavelength 450 nm according to someone on the ship. What (a) wavelength and (b) color (blue, green, yellow, or red) are detected by someone on Earth watching the ship?
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