A man in a spaceship moving with a speed of 0.6c away from a space platform shines a light of wavelength 500 nm toward the platform. What is the frequency (in Hz) of the light as seen by an observer on the platform? a) 3.9x10¹4 b) 1.2x10¹5 c) 2x1014 d) 1.8x1015 e) 3x1014 f) 9.2x1014 a b
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