Homework Help: chemistry

Posted by Shay on Wednesday, September 26, 2012 at 2:30pm.

The half-life for the radioactive decay of calcium-47 is 4.5 days.If a sample has an activity of 4.00uCi after 13.5 days, what was the initial activity of the sample?

chemistry - DrBob222, Wednesday, September 26, 2012 at 2:49pm
13.5days/4.5 days = 3 half lives.
(Activity/2³) = 4
Solve for activity.

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