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Physics, 06.02.2020 02:48 selena827

If a spectral line from a distant star is measured to have a wavelength of 497.15 nm, but is normally at 497.22 nm how fast (speed, not velocity) with respect to the earth is the star moving in m/s

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If a spectral line from a distant star is measured to have a wavelength of 497.15 nm, but is normall...
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