1. absorption spectrum the spectrum of electromagnetic radiation that has passed through a medium that absorbed radiation of certain wavelengths
  2. absorption factor (physics) the property of a body that determines the fraction of the incident radiation or sound flux absorbed or absorbable by the body
  3. action spectrum the efficiency with which electromagnetic radiation produces a photochemical reaction plotted as a function of the wavelength of the radiation
  4. absorption indicator an indicator used in reactions that involve precipitation
  5. emission spectrum spectrum of electromagnetic radiation emitted by a self-luminous source
  6. malabsorption syndrome a pattern of symptoms including loss of appetite and bloating and weight loss and muscle pain and steatorrhea; associated with celiac disease and sprue and cystic fibrosis
  7. acoustic spectrum the distribution of energy as a function of frequency for a particular sound source
  8. absorption band a dark band in the spectrum of white light that has been transmitted through a substance that exhibits absorption at selective wavelengths
  9. absorption unit a unit for measuring absorption
  10. speech spectrum the average sound spectrum for the human voice
  11. ultraviolet spectrum the spectrum of ultraviolet radiation
  12. infrared spectrum the spectrum of infrared radiation
  13. visible spectrum the distribution of colors produced when light is dispersed by a prism
  14. atomic spectrum (physics) a spectrum of radiation caused by electron transitions within an atom; the series of spectrum lines is characteristic of the element
  15. radio spectrum the entire spectrum of electromagnetic frequencies used for communications; includes frequencies used for radio and radar and television
  16. absorption coefficient a measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance; the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber
  17. observation station a station set up for making observations of something
  18. observation post an elevated post affording a wide view
  19. color spectrum the distribution of colors produced when light is dispersed by a prism
  20. sound spectrum the distribution of energy as a function of frequency for a particular sound source

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