In which of the following, emission of electrons does not take place
‐rays emission
Text Solution
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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 of electrons from the metal surface on irradiation with radiation of suitable frequency.
‐rays emission: They are due to transitions in the inner energy levels of the atom.
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