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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.
संबंधित प्रश्न
Answer the following questions based on a hot cathode ray tube.
State the approximate voltage used to heat the filament
A radioactive substance is oxidized. What changes would you expect to take place in the nature of radioactivity? Explain your answer.
Define free electrons.
What do you mean by electron emission?
What do you understand by the term radioactivity?
Two radioactive nuclei are represented by xAp and yAq and when p and q are mass numbers and x, y are the atomic number. How can the products be represented, i .e., what are the new values of p, q. x and y after the emission of an α-particle and a β-particle from A and B respectively.
From α, β and γ-rays, name the one which travels with the speed of light?
What is the value of the speed of gamma radiations in air or vacuum?
Mention four properties of Becquerel rays.
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]
