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प्रश्न
State two characteristics of the substance used as thermionic emitter.
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उत्तर
(i) The substance must have high melting point.
(ii) The work function of the substance should be low so that electrons may be emitted even at low temperature.
संबंधित प्रश्न
In a cathode ray tube state:
(i) the purpose of covering cathode by thorium and carbon.
(ii) the purpose of the fluorescent screen.
(iii) how is it possible to increase the rate of emission of electrons.
What are isobars?
What do you mean by Mass number.
In a cathode ray tube state the purpose of the fluorescent screen.
Justify with reason, whether the following nuclear reactions are allowed or not.
\[\ce{^A_Z X -> ^A_{Z + 1}Y + ^0_{-1}β}\]
From α, β and γ-rays, name the one which is not affected by electric or magnetic field?
State three ways of obtaining an electron-beam.
Mention four properties of Becquerel rays.
88Ra226 experiences three α - decay. Find the number of neutrons in the daughter element.
