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posted by  bchsrfswm on 11/29/2008 6:14:50 PM  |  status: Closed  

Please double check..

Course Textbook Chapter Problem
Calculus N/A N/A N/A
Question Details:
I have a problem that states that the half-life of Polonium-28 is 3.1 minutes. An exponential decay models with No being the initial amount or concentration. To find k (rate of decay) I set so that k = -0.2236.
The next part of the problem suggests that there is now 1500 grams of the element. It wants to know how much remains after 200 years?
.This comes out to 5.6812E-17. Did I do this correctly?
Thanks for any help or suggestions.
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posted by leettab on 11/29/2008 6:48:09 PM  |  status: Live
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bchsrfswm's comment:
"Good eye. Thanks for the help!"
Response Details:
Where you are making your error is not changing the 200 years into minutes.  The half life is 3.1 MINUTES. So after 200 years there will be essentially nothing left.  Let me know if you have any questions.  If you meant 200 minutes then you are correct.
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