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February 28, 2015

February 28, 2015

Posted by **Matt** on Tuesday, July 20, 2010 at 2:04pm.

- Chemistry -
**DrBob222**, Tuesday, July 20, 2010 at 2:44pmYou can do this two ways.

No/N = 2^{n}

12/N = 2^{2.5*24/15}

12/N = 16

N = 12/16 = 0.75 mCi after 2.5 days.

Other way.

Calculate k from 0.69315/15 = 0.04621 and substitute into the following:

ln(No/N) = kt

No = 12

N = ??

k = from above.

t = 2.5 days in hours is 2.5 x 24 = 60

ln(12/N) = 0.69315/60

Solve for N = 0.75 mCi.

- Chemistry -
**Anonymous**, Saturday, January 28, 2012 at 2:44pm1.0 mCi is the freakin answer.

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