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13 April, 06:58

Thorium-234 has a half-life of 24.1 days. How much of a 100-g sample of thorium-234 will be unchanged after 48.2 days?

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  1. 13 April, 06:59
    0
    25G is the answer for sure.
  2. 13 April, 07:20
    0
    Half-life means that the matter degrades by 50% at each interval. 48.2 days is 2 intervals.

    So, it would go down by 50% in the first interval, making it 50g. Then it would go down by another 50% from there, making the final amount of undecayed thorium-234 25g.
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