A certain line in the spectrum of the light from a nebula has a wavelength of 656 nm instead of the 434 nm measured in the laboratory. If the nebula is movingr radially what is its speed relative to the Earth?
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A certain line in the spectrum of the light from a nebula has a wavelength of 656 nm instead of the 434 nm measured in the laboratory. If the nebula is movingr radially what is its speed relative to the Earth?
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