How many half-lives have passed if the parent:daughter ratio is 1:3?

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      2 half-lives
      1 half-life
      3 half-lives
      4 half-lives
      cannot be determined
asked Mar 12, 2013 in Earth Science by anonymous
    

1 Answer

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2 half-lives
answered Mar 15, 2013 by h20 ~Top Expert~ (6,320 points)

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