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Cathode ray

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Cathode rays or electron beam (e-beam) are streams of electrons observed in discharge tubes. If an evacuated glass tube is equipped with two electrodes and a voltage is applied, glass behind the positive electrode is observed to glow, due to electrons emitted from the cathode (the electrode connected to the negative terminal of the voltage supply). They were first observed in 1859 by German physicist Julius Plücker and Johann Wilhelm Hittorf, and were named in 1876 by Eugen Goldstein Kathodenstrahlen, or cathode rays. In 1897, British physicist J. J. Thomson showed that cathode rays were composed of a previously unknown negatively charged particle, which was later named the electron. Cathode-ray tubes (CRTs) use a focused beam of electrons deflected by electric or magnetic fields to render an image on a screen.

Cathode ray - Wikipedia Jump to content From Wikipedia, the free encyclopedia Beam of electrons observed in vacuum tubes This article needs more citations . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . Find sources: "Cathode ray" – news · newspapers · books · scholar · JSTOR ( February 2011 ) ( Learn how and when to remove this message ) A beam of cathode rays in a vacuum tube bent into a circle by a magnetic field generated by a Helmholtz coil . Cathode rays are normally invisible; in this demonstration Teltron t

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