cse • paper_1 • mechanics
[UPSC CSE 2024] Special Theory of Relativity (Q321, 5M)
A galaxy in the constellation Ursa Major is receding from the Earth at 15000\text{ km/s}. If one of the characteristic wavelengths of light emitted by the galaxy is 550\text{ nm}, what is the corresponding wavelength measured by astronomers on the Earth?
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