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4 May, 07:40

If a substance has a half-life of 10 million years, what fraction of the atoms

remain after 20 million years?

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Answers (1)
  1. 4 May, 10:45
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    Answer is 1/4 of the atoms

    at 0 years it would be the full amount (X)

    at 10 million years you have half: X/2

    at 20 million years you have 1/4 because: (X/2) / 2 will equal 1/4
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