17. Radioactivity happens due to disintegration of (a) Nucleus (b) Mass (c) Electrons (d) Protons
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Electrons is the right answer
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ANSWER :- [A] NUCLEUS
EXPLANATION :- The radioactivity of a material refers to the rate at which it emits radiation. The activity of a sample of radioactive material is determined by measuring the number of disintegrations per unit of time. A disintegration occurs each time a nucleus ejects particles or energy.
EXPLANATION 2 :- Radioactivity is the phenomenon of the spontaneous disintegration of unstable atomic nuclei to atomic nuclei to form more energetically stable atomic nuclei. Radioactive decay is a highly exoergic, statistically random, first-order process that occurs with a small amount of mass being converted to energy.
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