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13 April, 22:08

How much of a sample remains after three half-lives have occurred?

1/16 of the original sample

119 of the original sample

1/8 of the original sample

1/3 of the original sample

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  1. 13 April, 22:24
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    1/8 of original sample.

    Explanation:

    Consider your final amount is 100 g.

    After three half lives:

    at 0 = 100 g

    1 half life = 100/2 = 50 g

    2 half life = 50/2 = 25 g

    3 half life = 25/2 = 12.5 g

    Know multiply the amount after three half lives with 8.

    12.5 g * 8 = 100 g

    So, after three half lives 1/8 of original sample is present.
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