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19 October, 19:24

14) Oxygen-15 has a half-life of 2 minutes. How old is the substance after 5 half-lives?

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  1. 19 October, 20:24
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    10 minutes old.

    Explanation:

    each half life is 2 minutes, meaning it takes 2 minutes for a half life to pass. After five 2 minute chucks of time, 10 minutes have passed. mathematically 2*5 = 10
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