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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
C
d
e
(D
ا
f

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