Which of the following terms refers to the radiation that occurs when an electron spontaneously drops down from an outer shell of an ionized atom to fill a vacancy in an inner shell of that atom?

Question

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Characteristic radiation is emitted when an electron drops down to fill a vacancy in an inner shell of an ionized atom. This creates a hole in the atom's electron cloud, which is then filled by an electron from an outer shell. The energy released by this electron as it drops into the hole is emitted as a photon, which is characteristic of the element being ionized.

Which of the Following Terms Refers to the Radiation That