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Running Head: ASTRONOMY
What kind of spectra are those in Group A? What kind are Group B?
1. Group A consists of an Emission Line Spectrum. Emission spectra are produced by thin
gases in which the atoms do not experience many collisions (because of the low density). The
emission lines correspond to photons of discrete energies that are emitted when excited atomic
states in the gas make transitions back to lower-lying levels.
Group B consists of an Absorption line Spectrum. This is in some ways the converse of an