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We compare the visible spectra of hydrogen, helium, and neon gas discharge tubes. For comparison we also have an incandescent tungsten filament. Notice that the gases in the tubes emit light only in discrete colors, while the incandescent filament emits light in a continuous range. The spectra of each element is like a unique fingerprint that describes its quantum nature, and has long been used by astronomers to deduce the composition of stars and nebulae billions (and billions) of miles away.
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