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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
What happens to the mass number of an element when (i) an α -particle, (ii) a β -particle, and (iii) γ -radiation is emitted?
What are the uses of radioactive isotopes in following?
(a) Medical field,
(b) Agriculture,
(c) Industries?
How is a cathode ray tube used to convert an electrical signal into a visual signal?
Name a common device where a hot cathode ray tube is used.
What is the value of the speed of gamma radiations in air or vacuum?
Two radioactive sources A and B of half lives of 1 hour and 2 hours, respectively, initially contain the same number of radioactive atoms. At the end of two hours, their rates of disintegration are in the ratio of ______.
Which of the following correctly describes the properties of an alpha particle?
How does the ionising power of beta particles compare with that of alpha particles?
