Question

Give two examples from everyday life where cathode ray tubes are used.

Answer 1

Hint: A cathode-ray tube (CRT) is a vacuum tube with one or more electron guns, which control their beams to show pictures on a phosphorescent screen. Electrical waveforms (oscilloscope), visuals (television set, computer display), radar targets, and other events might be represented by the images.

Complete answer:
A picture tube is the popular name for a CRT on a television set. CRTs have also been employed as memory devices, in which case the screen is not meant to be seen. The whole front region of the tube is scanned frequently and systematically in a predefined pattern termed a raster in television sets and computer displays. A colour image is created by adjusting the intensity of three electron beams, one for each additive primary colour (red, green, and blue), with a video signal serving as a reference in colour devices. Magnetic deflection is used to bend the beams in contemporary CRT displays and televisions using a deflection yoke. In oscilloscopes, electrostatic deflection is widely utilised.
A CRT emits electrons that are manipulated and focussed by electrodes by electrically heating a tungsten coil, which then warms a cathode in the back of the CRT. The electrons are guided by deflection coils or plates, and an anode speeds them towards the phosphor-coated screen, which produces light when they collide.
Hence (i) Television picture tube (ii) fluorescent light tubes is the answer.

Note:
CRTs have been replaced by flat-panel display technologies such as LCD, plasma display, and OLED displays from the early 2010s, which are less expensive to build and operate, as well as much lighter and less bulky. Flat-panel displays may be manufactured in extremely large sizes, whereas CRTs were limited to 40 in (100 cm) to 45 in (110 cm).