A spacecraft flying away from earth at a speed of 0 . 9 5 c shines a
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Question:
A spacecraft flying away from earth at a speed of c shines a communications laser back towards earth.
a How fast does an observer on earth measure the laser light to be travelling?
b Earths atmosphere has minimum absorption for electromagnetic waves around a wavelength of nm What wavelength and colour should the ships communication
laser be to maximize the chances of it being received by a ground station on earth?
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