What is the radial speed of the quasar with respect to earth

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Problem: When studying the optical spectrum of a very distant quasar(quasi stellar object), they found that a certain spectral line appears at a wavelength of 520 nm instead of the regular 418nm, in terms of the speed of the light, what is the radial speed of the quasar with respect to earth?

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Reference no: EM13701291

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