A spaceship is moving away from Earth at...

A spaceship is moving away from Earth at speed 0.333c. A source on the rear of the ship light at wave length 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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The correct Answer is:

(a) 636 nm; (b) red

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