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photoelectric process

См. также в других словарях:

  • photoelectric effect — Physics. the phenomenon in which the absorption of electromagnetic radiation, as light, of sufficiently high frequency by a surface, usually metallic, induces the emission of electrons from the surface. Also called photoemission. [1890 95] * * *… …   Universalium

  • Photoelectric effect — The photoelectric effect is a quantum electronic phenomenon in which electrons are emitted from matter after the absorption of energy from electromagnetic radiation such as x rays or visible light.cite book | title = Physics for Scientists… …   Wikipedia

  • Bessemer process — The Bessemer process was the first inexpensive industrial process for the mass production of steel from molten pig iron. The process is named after its inventor, Henry Bessemer, who took out a patent on the process in 1855. The process was… …   Wikipedia

  • radiation measurement — ▪ technology Introduction       technique for detecting the intensity and characteristics of ionizing radiation, such as alpha, beta, and gamma rays or neutrons, for the purpose of measurement.       The term ionizing radiation refers to those… …   Universalium

  • Scintillator — Scintillation crystal surrounded by various scintillation detector assemblies …   Wikipedia

  • quantum-equivalence law — noun : a principle of photoelectric action: when a quantum of radiation is involved in a photoelectric process its whole energy reappears in other forms since photoelectric processes do not absorb fractional quanta as do some other processes (as… …   Useful english dictionary

  • X-ray — [ 22 December 1895 and presented to Professor Ludwig Zehnder of the Physik Institut, University of Freiburg, on 1 January 1896. The dark oval on the third finger is a shadow produced by her ring. [cite book last = Kevles first =Bettyann Holtzmann …   Wikipedia

  • Auger effect — /oh zhay /, Physics. a nonradiative process in which an atom in an excited state undergoes a transition to a lower state by the emission of a bound electron (Auger electron) rather than by the emission of an x ray. Also called autoionization.… …   Universalium

  • xeroradiography — Radiography using a specially coated charged plate instead of x ray film, developing with a dry powder rather than liquid chemicals, and transferring the powder image onto paper for a permanent record; edge enhancement …   Medical dictionary

  • quantum efficiency — noun also quantum yield : the ratio of the number of photoelectrons released in a photoelectric process to the number of radiation quanta absorbed * * * quantum efficiency noun In a photocell or in photosynthesis, the number of electrons released …   Useful english dictionary

  • radiation — radiational, adj. /ray dee ay sheuhn/, n. 1. Physics. a. the process in which energy is emitted as particles or waves. b. the complete process in which energy is emitted by one body, transmitted through an intervening medium or space, and… …   Universalium

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