A star is know to be moving away from Earth at a speed of 4 X 104

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A star is know to be moving away from Earth at a speed of 4 X 104 m/s. This speed is determined by measuring the shift of the Ha line (λ = 656.3nm). By how much and in what direction is the shift of the wavelength of the Ha line?
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Fundamentals of Physics

ISBN: 978-0471758013

8th Extended edition

Authors: Jearl Walker, Halliday Resnick

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