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प्रश्न
What do you mean by electron emission?
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उत्तर
Free electrons leave the metal surface only if sufficient energy is supplied to the metal. This emission of electrons from metal surface is called the electron emission.
संबंधित प्रश्न
State the energy conversion taking place in a cathode ray tube
Write one use of cathode ray tube.
What do you mean by Atomic number
What do you mean by Atomic mass?
What happens to the mass number of an element when (i) an α -particle, (ii) a β -particle, and (iii) γ -radiation is emitted?
In the following fig. shows a radioactive source S in a thick lead container. The radiations pass through an electric field between the plates P and Q. Complete the diagram to show the paths of α , β and γ radiations.
Why is the source S placed in a thick lead container?
Name a common device where a hot cathode ray tube is used.
It is advised not to touch a radioactive substance by hand. Give reason.
Which type of radioactive emission is strongly ionising in nature?
Which decay process involves the emission of a particle with a comparatively large mass and a positive charge?
