Internet Encyclopedia of Science
SPECTRA & SPECTROSCOPY
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emission line


Balmer spectrum of hydrogen
The Balmer spectrum of hydrogen
A bright line in the spectrum of a luminous object caused by the emission of light at a particular wavelength. Emission lines may appear on their own, as in the spectrum of a nebula energized by radiation from a nearby hot star, or they may be superimposed on an absorption spectrum, as happens when a star is surrounded by hot gas.


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