Advertisements
Advertisements
प्रश्न
How can they be made to leave the metal surface? (State any two ways)
Advertisements
उत्तर
Electron emission from the metal surface can be (any two):
1) Thermionic emission – when energy is supplied as heat
2) Photoelectric emission – when energy is supplied as energy.
3) Field emission – when energy is supplied by applying an electric field to accelerate the electrons.
4) Secondary emission – when energy is supplied from the kinetic energy of other electrons on collisions with them.
APPEARS IN
संबंधित प्रश्न
A radioactive substance is oxidized. Will there be any change in the nature its radioactivity? Give a reason for your answer
Name a gas caused by the Greenhouse effect
State any two precautions to be taken while handling radioactive substances
What do you mean by Mass number.
Radioactive substances were found to give off three types of rays. Name them. How do they
(a) React to the magnetic field?
(b) React to the electric field?
(c) Act when different thickness of lead sheets is placed in their path?
What are the uses of radioactive isotopes in following?
(a) Medical field,
(b) Agriculture,
(c) Industries?
What is meant by Radioactivity?
State three common properties of beta rays and cathode rays.
Heavy radioactive elements eventually turn into ______.
