cathode ray
Noun: A stream of electrons emitted from the negative electrode (cathode) inside a vacuum tube, typically when it is heated or subjected to a high voltage. This ray is fundamental to the operation of older television and computer monitor screens (cathode ray tubes), oscilloscopes, and certain types of scientific equipment.
The term "cathode ray" is used to describe the specific electron beam itself, its properties, and its applications in technology and physics. - It is a technical, scientific term. - It is typically used as a singular noun ("a cathode ray") but can be used in the plural ("cathode rays") when referring to the phenomenon or multiple beams.
- In a classic television, the picture is created when a cathode ray scans across the phosphor-coated screen.
- Early experiments with cathode rays led to the discovery of the electron.
- The scientist adjusted the magnetic field to deflect the cathode ray.
- Cathode ray tube (CRT): A vacuum tube in which one or more cathode rays produce images on a phosphorescent screen. This is a compound term where "cathode ray" functions as a modifier.
- Before flat screens, most computer monitors were bulky cathode ray tubes.
- Cathode: The negative electrode from which the ray originates.
- Anode ray: A stream of positive ions moving toward a cathode; a related but distinct concept.
- Electron beam: A more general synonym for a stream of electrons, which may not always originate in a classic cathode ray tube setup.
- Electron beam (in the context of a vacuum tube)
The term specifically refers to the historical and technical context of electrons emitted from a cathode in a gas discharge tube or vacuum tube. While all cathode rays are electron beams, not all electron beams (e.g., those in modern particle accelerators) are traditionally called cathode rays.
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a beam of electrons emitted by the cathode of an electrical discharge tube
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