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any array of light that is visible, an ordered array of the components of an emission or wave
a nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy
a series of bright lines of particular wavelengths produced by a hot gas under low pressure
the spectrum of electromagnetic radiation that has passed through a medium that absorbed radiation of certain wavelengths
change in the apparent frequency of a wave as observer and source move toward or away from each other
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