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| the analogous motion of the particles of a mass of air or the like, whose state of equilibrium has been disturbed, as in transmitting sound |
| the removal of energy or particles from a beam by the medium through which the beam propagates |
| absorption spectrum | |
| —n | |
| the characteristic pattern of dark lines or bands that occurs when electromagnetic radiation is passed through an absorbing medium into a spectroscope. An equivalent pattern occurs as coloured lines or bands in the emission spectrum of that medium | |
absorption spectrum n.
The electromagnetic spectrum, broken by a specific pattern of dark lines or bands, observed when radiation traverses a particular absorbing medium.
| absorption spectrum
The range of frequencies of electromagnetic radiation readily absorbed by a substance by virtue of its chemical composition. See more at atomic spectrum. |