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In which of the following, emission of electrons does not take place (a) Thermionic emission (b) X-rays emission (c) Photoelectric emission (d) Secondary emission



In which of the following, emission of electrons does not take place


(a)    Thermionic emission


(b)    X-rays emission


(c)    Photoelectric emission


(d)    Secondary emission


Grade:11

1 Answers

Hrishant Goswami
343 Points
7 years ago

(b)

Thermionic emission: When a metal is heated to a high temperature, the free electrons gain kinetic energy and escape from the surface of the metal.

 

Secondary emission: When an electron strikes the surface of a metallic plate, it emits other electrons from the surface.

 

Photoelectric emission: Emission of electrons from the metal surface on irradiation with radiation of suitable frequency.

 

X-rays emission: High speed electrons (emitted from a filament) striking a target (a copper block) to emit X-rays.

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