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प्रश्न
How can they be made to leave the metal surface? (State any two ways)
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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.
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संबंधित प्रश्न
Answer the following questions based on a hot cathode ray tube.
What will happen to the beam when it passes through the electric field?
What are free electrons?
Why is a cathode ray tube evacuated to a low pressure?
What do you mean by Atomic mass
What happens to the atomic number of element when (i) An α -particle, (ii) A β -particle 1 and (iii) γ-radiation is emitted?
Define free electrons.
How is a cathode ray beam affected while passing through a magnetic field?
In a cathode ray tube state the purpose of covering cathode by thorium and carbon.
In a cathode ray tube state. How is it possible to increase the rate of emission of electrons.
