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23 May, 06:33

The half-life of cobalt-60 is 5.20 yr. how many milligrams of a 2.000-mg sample remain after 10.50 years?

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  1. 23 May, 09:49
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    Final amount = initial anount * (1/2) ^ (t/half life)

    final amount = 2.000 mg * (1/2) ^ (10.5/5.20) = 0.493 mg remain after 10.5 years
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