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

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

AIPMTAIPMT 1990Electromagnetic Waves

Solution:

Thermionic emission : When a metal is heated to a high temperature, the free electron 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 o felectrons from the metal surface on irradiation with radiation of suitable frequency
X-rays emission : They are due to transitions in the inner energy levels of the atom