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Question 24
A spaceship, moving away from the Earth at a speed of 0.9c, shines a green laser at Earth. An observer on Earth would see the light arriving at a speed of:
(4)
O A. 0.1c but at a smaller frequency.
OB. 0.1c but higher frequency
OC. c but at a shorter wavelength.
D. c but longer wavelength.
OE. 0.1c and with an inverted frequency

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