cathode rays

cathode rays
Electron E*lec"tron, n. [NL., fr. Gr. 'h`lektron. See {Electric}.] 1. Amber; also, the alloy of gold and silver, called {electrum}. [archaic] [1913 Webster]

2. (Physics & Chem.) one of the fundamental subatomic particles, having a negative charge and about one thousandth the mass of a hydrogen atom. The electron carries (or is) a natural unit of negative electricity, equal to 3.4 x 10^{-10} electrostatic units, and is classed by physicists as a {lepton}. Its mass is practically constant at the lesser speeds, but increases due to relativistic effects as the velocity approaches that of light. Electrons are all of one kind, so far as is known. Thus far, no structure has been detected within an electron, and it is probably one of the ultimate composite constituents of all matter. An atom or group of atoms from which an electron has been detached has a positive charge and is called a {cation}. Electrons are projected from the cathode of vacuum tubes (including television picture tubes) as {cathode rays} and from radioactive substances as the {beta rays}. Previously also referred to as {corpuscle}, an obsolete term. The motion of electrons through metallic conductors is observed as an electric current. A particle identical to the electron in mass and most other respects, but having a positive instead of a negative charge, is called a {positron}, or {antielectron} [Webster 1913 Suppl. +PJC]

The Collaborative International Dictionary of English. 2000.

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Look at other dictionaries:

  • cathode rays — plural noun Streams of negatively charged particles (electrons) proceeding from the cathode of a vacuum tube • • • Main Entry: ↑cathode * * * cathode rays, the invisible streams of electrons from the cathode in a vacuum tube. When cathode rays… …   Useful english dictionary

  • cathode rays — n. streams of electrons projected from the surface of a cathode: cathode rays produce X rays when they strike solids * * * …   Universalium

  • cathode rays — n. streams of electrons projected from the surface of a cathode: cathode rays produce X rays when they strike solids …   English World dictionary

  • cathode rays — katodiniai spinduliai statusas T sritis fizika atitikmenys: angl. cathode rays; Lenard rays vok. Katodenstrahlen, m; Lenard Strahlen, m rus. катодные лучи, m; лучи Ленарда, m pranc. faisceaux cathodiques, m; rayons cathodiques, m; rayons de… …   Fizikos terminų žodynas

  • cathode rays — katodiniai spinduliai statusas T sritis chemija apibrėžtis Iš katodo viena kryptimi judančių ir elektrinio lauko pagreitintų elektronų srautas. atitikmenys: angl. cathode rays rus. катодные лучи …   Chemijos terminų aiškinamasis žodynas

  • cathode rays — negative particles of electricity streaming out in a vacuum tube at right angles to the surface of the cathode and away from it irrespective of the position of the anode. They move in a straight line unless deflected by a magnet. By striking on… …   Medical dictionary

  • Cathode ray — Cathode rays (also called an electron beam or e beam) are streams of electrons observed in vacuum tubes, i.e. evacuated glass tubes that are equipped with at least two electrodes, a cathode (negative electrode) and an anode (positive electrode)… …   Wikipedia

  • cathode-ray tube — n a vacuum tube in which a beam of electrons is projected on a fluorescent screen to produce a luminous spot * * * a vacuum tube in which the cathode rays are accelerated as a beam to form luminous spots on a fluorescent screen …   Medical dictionary

  • cathode ray tube — ► NOUN ▪ a high vacuum tube in which cathode rays produce a luminous image on a fluorescent screen, used in televisions and visual display units …   English terms dictionary

  • cathode ray — a flow of electrons emanating from a cathode in a vacuum tube and focused into a narrow beam. [1875 80] * * * Stream of electrons leaving the negative electrode, or cathode, in an evacuated or gas filled discharge tube or emitted by a heated… …   Universalium

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