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Paper 2 · Nuclear Physics and Radioactivity

Define radioactive decay.

Model answer

random decay of unstable nuclei

Also accepted: spontaneous disintegration of nuclei, random breakdown of unstable atoms

Explanation: Radioactive decay is the random, spontaneous disintegration of unstable atomic nuclei, with the emission of radiation.

Derived from ZIMSEC Physics Paper 2, June 2003, Q8

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