Question

Name a common device that uses a hot cathode ray tube.

Answer 1

Hint: In a cathode ray tube, cathode refers to the heated filament which is placed in a vacuum tube made of glass and the ray refers to the stream of electrons generated by the cathode in the tube. The images produced by the striking of the electrons on the fluorescent screen can be made to move by placing electric or magnetic plates along the path of the ray of electrons.

Complete step by step answer:
Explain a hot cathode ray tube and name a device that uses it.
Electrons are ejected by an electron gun placed at one end of the cathode ray tube. These electrons will move in a straight path but can be made to bend or deflect from this path. The electrons travel the length of the tube to reach the anode present on the other end of the tube. The fluorescent screen is placed just past the anode. The stream of electrons will then strike the screen and thereby make a visible spot on it. Now, the usage of magnetic or electric plates along the path of the stream of electrons will cause the spot on the screen to move.
A common device that makes use of this cathode ray tube is the old television.

Note: The cathode ray television has a phosphorous screen and has three electron guns as the video part of the signal is split into a red signal, a blue signal and a green signal. A combination of these colours in different ratios will produce coloured images. The portion on the television screen where the stream of electrons does not strike will be dark.