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27 October, 11:29

If you have 200 grams of a radioactive sample, how many grams would be left after three half-lives? a. 200 b. 150 c. 50 d. 25

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  1. 27 October, 14:46
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    D. 25

    After 1 half-life: goes from 200 to 100

    After a 2nd half-life: goes from 100 to 50

    After a 3rd half-life: goes from 50 to 25
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