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Question: Radioactive decay is defined as

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  1.  The decrease in the amount of any radioactive material due to the spontaneous emission of nuclear radiation from the nucleus
  2.  The decomposition of radioactive atoms due to lengthy exposure to direct sunlight
  3.  The gradual decrease in the number of radioactive atoms in radioactive material due to spontaneous fission
  4.  The decline in the strength of a radioactive source due to the combined effects of time, distance, and shielding

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1. The decrease in the amount of any radioactive material due to the spontaneous emission of nuclear radiation from the nucleus

Radioactive decay is defined as the decrease in the amount of any radioactive material due to the spontaneous emission of nuclear radiation from the nucleus.

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