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22 April, 17:57

a 160 milligram sample of a radioactive isotope decays to 10 kilograms in 12 years. what is the half life of this element

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  1. 22 April, 18:25
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    3 years

    Explanation:

    Given dа ta:

    Initial amount of sample = 160 Kg

    Amount left after 12 years = 10 Kg

    Half life = ?

    Solution:

    at time zero = 160 Kg

    1st half life = 160/2 = 80 kg

    2nd half life = 80/2 = 40 kg

    3rd half life = 40 / 2 = 20 kg

    4th half life = 20 / 2 = 10 kg

    Half life:

    HL = elapsed time / half life

    12 years / 4 = 3 years
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