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4 September, 09:25

The half-life of a certain element is 100 days. How many half-lives will it be before only one-eighth of this element remains?

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  1. 4 September, 10:49
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    After 1 half life its half the element

    after 2 hl its quarter remaining

    after 3 hl its half the quarter which is 1 eighth

    after 3 half lifes
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