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प्रश्न
State two properties that a substance should possess when used as a thermionic emitter.
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उत्तर
Two properties are:
(i) High melting point. (ii) Low work function.
संबंधित प्रश्न
State three factors on which the rate of emission of electrons from a metal surface depends
What are free electrons?
What are the types of emission?
From α, β and γ-rays, name the one which travels with the speed of light?
It is advised not to touch a radioactive substance by hand. Give reason.
Unit of radioactivity is _______
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]
While investigating which phenomena was Becquerel studying uranium salts when he discovered radioactivity?
Which decay process involves the emission of a particle with a comparatively large mass and a positive charge?
