katodene
Katodene, also known as the cathode ray tube (CRT), is a vacuum tube containing an electron gun (a source of electrons) and a fluorescent screen. The electron gun generates a beam of electrons that is accelerated and focused by electric and magnetic fields. This beam is then directed at the fluorescent screen, which emits light when struck by the electrons. The intensity and position of the light emitted can be controlled to produce images or text on the screen.
Katodene was widely used in early television sets, computer monitors, and oscilloscopes. It was popular due
The term "katodene" is derived from the Greek word "katodos," meaning "going down," which refers to the