Homework Help: physics

Posted by Anonymous on Thursday, August 23, 2012 at 9:50am.

If a radioactive isotope has a half-life of 1 year, how much of the original sample will be left at the end of the 2nd year?

physics - Steve, Thursday, August 23, 2012 at 10:14am
after two half-lives, 1/4 is left

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