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kode kode
wrote...
Posts: 928
10 years ago
An important line of hydrogen occurs at a rest wavelength (as measured in a laboratory) of 656 nm. Each diagram below has this line labeled with its wavelength in the spectrum of a distant star. Rank the motion of the stars along our line of sight (radial motion) based on their speed and direction, from moving fastest toward Earth, through zero (not moving toward or away from Earth), to moving fastest away from Earth.
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