Advertisements
Advertisements
उत्तर
Cathode rays are used for:
(i) Converting electrical signal into a visual signal, (ii) In television.
APPEARS IN
संबंधित प्रश्न
Why do Free electrons not leave the metal surface on their own
A radioactive substance is oxidized. Will there be any change in the nature its radioactivity? Give a reason for your answer
Arrange α, β, and γ rays in ascending order with respect to their
1) Penetrating power.
2) Ionising power
3) Biological effect
In the following fig. shows a radioactive source S in a thick lead container. The radiations pass through an electric field between the plates P and Q. Complete the diagram to show the paths of α , β and γ radiations.
Why is the source S placed in a thick lead container?
Draw a diagram of a simple atom showing the nucleus and electrons. In this atom:
(a) What type of charge will there be on the nucleus?
(b) What is the value of this charge?
State two characteristics of the substance used as thermionic emitter.
In a cathode ray tube state the purpose of the fluorescent screen.
In a cathode ray tube state. How is it possible to increase the rate of emission of electrons.
Mention four properties of Becquerel rays.
88Ra226 experiences three α - decay. Find the number of neutrons in the daughter element.
