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October 31, 2014

Homework Help: Chemistry

Posted by Charleze on Sunday, May 23, 2010 at 2:56pm.

Ba-140 has a half life of 13.0 days. What fraction of a sample of Ba-140 will remain after 39 days?
A. 1/8th
B. 1/16th
C. 1/2th
D. 1/4th

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