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cathode ray
(redirected from Cathode-ray)

    Also found in: Medical, Encyclopedia, Wikipedia 0.04 sec.

cathode ray

Stream of fast-moving electrons that travel from a cathode (negative electrode) towards an anode (positive electrode) in a vacuum tube. They carry a negative charge and can be deflected by electric and magnetic fields. Cathode rays focused into fine beams of fast electrons are used in cathode-ray tubes, the electrons' kinetic energy being converted into light energy as they collide with the tube's fluorescent screen. The electrons are emitted from the heated metal cathode by a process called thermionic emission.



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