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प्रश्न
An electrons emitter must have how much work function and melting point.
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उत्तर
An electron emitter must have low work function and high melting point.
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संबंधित प्रश्न
A radiation X is focused by a particular device on the bulb of a thermometer and mercury in the thermometer shows a rapid increase. Name the radiation X
Why is a cathode ray tube evacuated to a low pressure?
State the penetrating range of α, β and γ radiations.
What are the uses of radioactive isotopes in following?
(a) Medical field,
(b) Agriculture,
(c) Industries?
State two characteristics of the substance used as thermionic emitter.
How is a cathode ray beam affected while passing through an electric field?
The activity of a certain radionuclide decreases to 15 percent of its original value in 10 days. What is its half life?
[ln (0.15) = -1.9]
