ifos • paper_1 • mechanics
[UPSC IFoS 2019] Special Theory of Relativity (Q345, 8M)
How fast and in what direction must galaxy A be moving if an absorption line found at wavelength 550\text{ nm} (green) for a stationary galaxy is shifted to 450\text{ nm} for galaxy A and how fast and in what direction is galaxy B moving if the same line is shifted to 700\text{ nm} for it ?
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