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16 April, 22:33

After two half-lives, how much of the original material has decayed?

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Answers (2)
  1. 16 April, 23:51
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    After two half-lives theres only going to be 25% of the original isotope, 75% of the decay product.
  2. 17 April, 01:17
    0
    75%

    Explanation:

    100 divided by 2 is 50, and 50 divided by 2 is 25. That's how much material you have left, so 75% of it has decayed.
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