रेडियोऐक्टिवता से आप क्या समझते हैं? रेडियोऐक्टिवता में एल्फा तथा बीटा क्षय की व्याख्या कीजिये।
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Answers Radioactivity is spontaneous disintegration of nucleus of radioactive substance with emissions of certain particles and radiation. Alpha are helium nuclei and beta are fast moving electrons
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