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posted by Haley Sunday, July 15, 2012 at 12:37pm.
A certain isotope has a half-life of 12 hrs. How long will it take for 100 ƒÝgr to decay into only 25 ƒÝgr?
since 25 is 1/4 of 100, that means two half-lives have passed: 24 hours.
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