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The half life of carbon-11 is 20 minutes. A sample of carbon-11 has25mCi. How much is left after 1 hour?*
A)12.5mci
B)10.2mCi
C)2.25mci
D)3.125mci

 Feb 15, 2021
 #1
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1 hour is 3 half lives

25 x 1/2 x 1/2 x 1/2 = 3.125 mCi

 Feb 15, 2021

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