when gamma ray is emitted by an unstable nucleus,....
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The emission of gamma rays does not alter the number of protons or neutrons in the nucleus but instead has the effect of moving the nucleusfrom a higher to a lower energy state (unstable to stable). Gamma ray emission frequently follows beta decay, alpha decay, and other nuclear decay processes.
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Gamma radiation is electromagnetic radiation that is emitted by an unstable nucleus of an atom during radioactive decay. A nucleus in an unstable state may fall to a more stable state by the emission of energy as gamma radiation. The radiation has a dual nature, that of a wave and a particle with zero mass at rest.
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