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17 August, 23:09

Cobalt-60 has a half life of 5.25 years. If you started with a 40 gram sample of pure cobalt-60, how many grams of cobalt-60 would remain after 10.5 years?

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  1. 18 August, 02:02
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    10 grams

    Explanation:

    A = A₀ (½) ^ (t / T)

    A = 40 (½) ^ (10.5 / 5.25)

    A = 40 (½) ^2

    A = 40 · ¼

    A = 10
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