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23 February, 23:56

4. Thorium-234 has a half-life of 24.1 days. What percentage of the original thorium-234 in a sample will remain after 144.6 days?

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  1. 24 February, 00:29
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    How many half lives have elapsed?

    actually the formula is like this

    A=P (1/2) ^ (t/h)

    P=iniital amount

    t=time

    h=half life

    A=final amount

    so

    hmm, percent

    so P=1 then

    A=1 (1/2) ^ (144.6/24.1)

    A=1 (1/2) ^6

    A=1/64

    A=0.05625

    so 5.625% is left
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