A spaceship is moving away from Earth at speed \( 0.333 c \). A source on the rear of the ship e...

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A spaceship is moving away from Earth at speed \( 0.333 c \).
A source on the rear of the ship emits light at wavelength \( 450 \mathrm{~nm} \) 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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