In which of the following,emission of electro | vedclass

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(B) $X$-rays emission: These are produced due to transitions in the inner energy levels of an atom,not by the emission of electrons from the surface.P

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$X$-rays emission

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(B) $X$-rays emission: These are produced due to transitions in the inner energy levels of an atom,not by the emission of electrons from the surface.Photoelectric emission: This is the emission of electrons from a metal surface upon irradiation with radiation of a suitable frequency.Secondary emission: When an incident electron strikes the surface of a metallic plate,it causes the emission of other electrons from the surface.Thermionic emission: When a metal is heated to a high temperature,the free electrons gain sufficient kinetic energy to escape from the surface of the metal.

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

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