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Noun. (physics) a measure of the width of the band of frequencies of radiation emitted or absorbed in an atomic or molecular transition; a result of the uncertainty principle.This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.
This entry was last updated on RefTopia from its source on 3/20/2012.