spectrum : Idioms & Phrases

Index

Absorption spectrum

  • noun the spectrum of electromagnetic radiation that has passed through a medium that absorbed radiation of certain wavelengths
WordNet
  • the spectrum of light which has passed through a medium capable of absorbing a portion of the rays. It is characterized by dark spaces, bands, or lines.
Webster 1913

acoustic spectrum

  • noun the distribution of energy as a function of frequency for a particular sound source
    acoustic spectrum.
WordNet

action spectrum

  • noun the efficiency with which electromagnetic radiation produces a photochemical reaction plotted as a function of the wavelength of the radiation
WordNet

atomic spectrum

  • noun (physics) a spectrum of radiation caused by electron transitions within an atom; the series of spectrum lines is characteristic of the element
WordNet

Chemical spectrum

  • a spectrum of rays considered solely with reference to their chemical effects, as in photography. These, in the usual photogrophic methods, have their maximum influence at and beyond the violet rays, but are not limited to this region.
Webster 1913

Chromatic spectrum

  • the visible colored rays of the solar spectrum, exhibiting the seven principal colors in their order, and covering the central and larger portion of the space of the whole spectrum.
Webster 1913

color spectrum

  • noun the distribution of colors produced when light is dispersed by a prism
    color spectrum.
WordNet

Continous spectrum

  • a spectrum not broken by bands or lines, but having the colors shaded into each other continously, as that from an incandescent solid or liquid, or a gas under high pressure.
Webster 1913

Diffraction spectrum

  • a spectrum produced by diffraction, as by a grating.
Webster 1913

electromagnetic spectrum

  • noun the entire frequency range of electromagnetic waves
WordNet

emission spectrum

  • noun spectrum of electromagnetic radiation emitted by a self-luminous source
WordNet

Gaseous spectrum

  • the spectrum of an incandesoent gas or vapor, under moderate, or especially under very low, pressure. It is characterized by bright bands or lines.
Webster 1913

infrared spectrum

  • noun the spectrum of infrared radiation
WordNet

line spectrum

  • noun a spectrum in which energy is concentrated at particular wavelengths; produced by excited atoms and ions as they fall back to a lower energy level
WordNet

mass spectrum

  • noun a distribution of ions as shown by a mass spectrograph or a mass spectrometer
WordNet

microwave spectrum

  • noun the part of the electromagnetic spectrum corresponding to microwaves
WordNet

Normal spectrum

  • a representation of a spectrum arranged upon conventional plan adopted as standard, especially a spectrum in which the colors are spaced proportionally to their wave lengths, as when formed by a diffraction grating.
Webster 1913

Ocular spectrum

  • . See Spectrum, 2 (b), above.
Webster 1913

Prismatic spectrum

  • (Opt.), the spectrum produced by the passage of light through a prism.
  • a spectrum produced by means of a prism.
Webster 1913

radio spectrum

  • noun the entire spectrum of electromagnetic frequencies used for communications; includes frequencies used for radio and radar and television
    radio spectrum.
WordNet

radio-frequency spectrum

  • noun the entire spectrum of electromagnetic frequencies used for communications; includes frequencies used for radio and radar and television
    radio spectrum.
WordNet

Solar spectrum

  • the spectrum of solar light, especially as thrown upon a screen in a darkened room. It is characterized by numerous dark lines called Fraunhofer lines.
Webster 1913

sound spectrum

  • noun the distribution of energy as a function of frequency for a particular sound source
    acoustic spectrum.
WordNet

Spectrum analysis

  • noun the use of spectroscopes to analyze spectra
    spectroscopic analysis; spectrometry; spectrographic analysis; spectroscopy.
WordNet
  • chemical analysis effected by comparison of the different relative positions and qualities of the fixed lines of spectra produced by flames in which different substances are burned or evaporated, each substance having its own characteristic system of lines.
Webster 1913

spectrum line

  • noun an isolated component of a spectrum formed by radiation at a uniform frequency
WordNet

speech spectrum

  • noun the average sound spectrum for the human voice
WordNet

Thermal conductivity, Thermal spectrum

  • . See under Conductivity, and Spectrum.
Webster 1913

Thermal spectrum

  • a spectrum of rays considered solely with reference to their heating effect, especially of those rays which produce no luminous phenomena.
Webster 1913

ultraviolet spectrum

  • noun the spectrum of ultraviolet radiation
WordNet

visible spectrum

  • noun the distribution of colors produced when light is dispersed by a prism
    color spectrum.
WordNet