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21 October, 19:33

The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass. Starting with 115 grams of a radioactive isotope, how much will be left after 3 half-lives? Use the calculator provided and round your answer to the nearest gram.

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  1. 21 October, 20:45
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    1st half-life: 115/2 = 57.5 grams

    2nd half-life: 57.5/2 = 28.75 grams

    3rd half-life: 28.75/2 = 14.375 grams = 14 grams
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