- 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 filament in certain electron tubes.Cathode rays cause fluorescent materials to luminesce and are utilized in cathode-ray oscilloscopes and television tubes (see cathode-ray tube).
* * *▪ physicsstream of electrons leaving the negative electrode (cathode) in a discharge tube containing a gas at low pressure, or electrons emitted by a heated filament in certain electron tubes. Cathode rays focused on a hard target (anticathode) produce X-rays or focused on a small object in a vacuum generate very high temperatures (cathode-ray furnace). When cathode rays strike certain molecules used to coat a cathode screen, they cause the molecules (and hence the screen) to emit light. This effect, when coupled with the controlled deflection of a cathode ray by electric or magnetic fields, gives rise to the cathode-ray oscilloscope (cathode-ray tube [CRT]) for monitoring variations and values of an alternating voltage or current and to the picture tube of television and radar.
* * *
Look at other dictionaries:
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 — Cathode Cath ode, n. [Gr. ? descent; ? down + ? way.] (Physics) The part of a voltaic battery by which the electric current leaves substances through which it passes, or the surface at which the electric current passes out of the electrolyte; the … The Collaborative International Dictionary of English
cathode ray — noun Cathode ray is used before these nouns: ↑tube … Collocations dictionary
cathode ray — Synonyms and related words: Becquerel ray, Grenz ray, Roentgen ray, X radiation, X ray, actinic ray, alpha radiation, alpha ray, anode ray, beta radiation, beta ray, canal ray, cathode glow, collision emission, cosmic radiation, cosmic ray,… … Moby Thesaurus
cathode ray — cath′ode ray n. elo a flow of electrons emanating from a cathode in a vacuum tube and focused into a narrow beam • Etymology: 1875–80 … From formal English to slang
cathode ray — /kæθoʊd ˈreɪ/ (say kathohd ray) noun a stream of electrons generated at the cathode during an electric discharge in an evacuated tube … Australian English dictionary
cathode ray — noun a beam of electrons emitted by the cathode of an electrical discharge tube • Hypernyms: ↑beam, ↑ray, ↑electron beam … Useful english dictionary
cathode ray — noun Date: 1880 1. plural the high speed electrons emitted in a stream from the heated cathode of a vacuum tube 2. a stream of electrons emitted from the cathode of a vacuum tube usually used in plural … New Collegiate Dictionary
cathode ray — noun a beam of electrons emitted from the cathode of a high vacuum tube … English new terms dictionary
cathode ray tube — UK US noun [countable] [singular cathode ray tube plural cathode ray tubes] physics a piece of equipment in televisions and some computers that creates the image on the screen. A beam of high energy … Useful english dictionary