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
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Answer:
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. Explanation: ... Thus in X-rays the emission of electrons does not take place.
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