cathode ray


cathode ray
a flow of electrons emanating from a cathode in a vacuum tube and focused into a narrow beam.
[1875-80]

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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).

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      stream 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.

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Universalium. 2010.

Look at other dictionaries:

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  • cathode ray — noun Cathode ray is used before these nouns: ↑tube …   Collocations dictionary

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  • 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

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  • 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


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