Question

(i) In a cathode ray tube what is the function of anode?
(ii) State the energy conversion taking place in the cathode ray tube.
(iii) Write one use of cathode ray tube.

Answer 1

Hint: We will use the definition of cathode ray tube along with its functions. Anode simply helps in the acceleration of electrons which are generated by the action of heat. The conversion is in the form of light which shows images on the screen by hitting electrons on fluorescent screens.

Complete answer:
First we will understand the cathode ray tube with the help of a diagram as shown below.

A cathode ray tube is a kind of a display screen with the help of which the images are produced in video type form. There is a vacuum inside and so, the electrons beam passing through anode displays images. The images appearing on the screen is a fluorescent screen. The images actually appear by the action of hitting electrons. A fluorescent screen is made up of either Zinc Sulphide or phosphorus which helps in emitting light.

The electrons are produced by the heating of the filament in cathode resulting into the loose electrons which get accelerated by anode after applying high voltage in its path. Due to the fact of electrostatic attraction the electrons get attracted towards the screen. The coils of deflection help in the controlling deflection of electrons to target on the screen.
(i) The anode gives acceleration to electrons which gives an energetic beam of source.
(ii) Clearly, the energy in the cathode ray tube is converting the electrical energy produced by heated filament in the coil into the energy of light.
(iii) A cathode ray is used in today 's televisions as well as computer monitors. Basically it is used mostly inside the technologies which show images by receiving electrons on its screen. This results in the display in the form of a video.

Note:
The most important things to be on finger tips are:
(1) Cathode ray tube functioning by basically learning the functions of deflection coil, cathode, heater, fluorescent screen and anode. It will be easy if understood with the help of diagrams once.
(2) The fluorescent screen should be such that it has a tendency to emit light. The best examples are Zinc sulphide and phosphorus.
(3) The starting of generation of electrons should be known. In this cathode ray tube the electrons are first loosen up by heating of the cathode which then moves forward to its path with the acceleration caused by anode.