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3 November, 00:42

A certain radioactive isotope has a half-life of 15 hours. How many hours are four half-lives?

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Answers (2)
  1. 3 November, 00:57
    0
    Each half life takes 15 hours

    starting at 0 hours, no half-lives have occurred

    at 15, one half life has happened

    at 30, two

    follow the pattern, and you'll see that it takes 60 hours for 4 half-lives to happen
  2. 3 November, 01:11
    0
    15 multiplied by 4 equals 60. so 4 half lives equals 60 hours also equals 2 full lives and one full life must equal 30 hours
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