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August 3, 2015

Homework Help: Chem

Posted by Colby on Tuesday, August 27, 2013 at 9:41pm.

Radioactive 24Na with a half-life of 14.8 hours is injected into an animal in a tracer experiment. How many hours will it take for the radioactivity to fall to 12.5% of its original intensity?

I am confused on what number to start with

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