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dark band in the spectrum of white light that has been transmitted through a substance that exhibits absorption at selective wavelengths absorption band
spectrum of electromagnetic radiation that has passed through a medium that absorbed radiation of certain wavelengths absorption spectrum
(physics) a spectrum of radiation caused by electron transitions within an atom; the series of spectrum lines is characteristic of the element atomic spectrum
electromagnetic radiation that would be radiated from an ideal black body; the distribution of energy in the radiated spectrum of a black body depends only on temperature and is determined by Planck's radiation law black-body radiation , blackbody radiation
spectrum colors blue , green , indigo , red , violet , yellow
Danish physicist who studied atomic structure and radiations; the Bohr theory of the atom accounted for the spectrum of hydrogen (1885-1962) Bohr , Niels Bohr , Niels Henrik David Bohr
German chemist who with Kirchhoff pioneered spectrum analysis but is remembered mainly for his invention of the Bunsen burner (1811-1899) Bunsen , Robert Bunsen , Robert Wilhelm Bunsen
broad spectrum semisynthetic antibiotic produced by modifying cephalosporin cephaloridine
one of several broad spectrum antibiotic substances obtained from fungi and related to penicillin (trade names Mefoxin); addition of side chains has produced semisynthetic antibiotics with greater antibacterial activity cephalosporin , Mefoxin
optical device consisting of a surface with many parallel grooves in it; disperses a beam of light (or other electromagnetic radiation) into its wavelengths to produce its spectrum diffraction grating , grating
electronic warfare undertaken to insure effective friendly use of the electromagnetic spectrum in spite of the enemy's use of electronic warfare ECCM , electronic counter-countermeasures
electronic warfare undertaken to prevent or reduce an enemy's effective use of the electromagnetic spectrum ECM , electronic countermeasures
military action involving the use of electromagnetic energy to determine or exploit or reduce or prevent hostile use of the electromagnetic spectrum electronic warfare , EW
spectrum of electromagnetic radiation emitted by a self-luminous source emission spectrum
electrical device that alters the frequency spectrum of signals passing through it filter
presence of groups of closely spaced spectrum lines observed in the atomic spectrum of certain elements fine structure
German physicist who with Bunsen pioneered spectrum analysis and formulated two laws governing electric networks (1824-1887) G. R. Kirchhoff , Gustav Robert Kirchhoff , Kirchhoff
spectrum of infrared radiation infrared spectrum
infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range infrared , infrared frequency
single frequency (or very narrow band) of radiation in a spectrum line
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