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5 October, 07:07

You have 40 g of a radioisotope. If the half-life of this radioisotope is 4 days, how many grams will remain after 12 days?

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  1. 5 October, 10:32
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    the number of grams of radioisotope that have remained after 12 days if the half life if 4 days is calculated as below

    calculate the number of half lives involved

    12/4 = 3 half live are involved

    40 after one half life = 40/2 = 20 g

    20g after the second half life = 20/2 = 10g

    10g after the third half life = 10/2 = 5 g

    therefore 5 g will be remaining
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