Homework Help: algebra - half lives

Posted by Tritium on Monday, November 7, 2011 at 10:40pm.

Half-life of tritium is 12.32 years.
Write decay equation as

N(t) = N(subzero)e^(-rt)
where t is the time in days, N(subzero) is the starting amt of tritium and N(t) is amt of tritium at time t.

don't know how to find -r.

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