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April 19, 2015

April 19, 2015

Posted by **Beth** on Friday, July 27, 2012 at 5:17pm.

- Physics -
**drwls**, Saturday, July 28, 2012 at 3:42amLet N be the number of half-lives.

(1/2)^N = 10^-4

N log(0.5) = log(10^-4)

-0.30103 N = -4

N = 13.29 half-lives

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