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November 26, 2014

Homework Help: chemistry

Posted by star on Monday, May 28, 2012 at 10:38am.

a radioactive material is undergoin nuclear decay. After 40 minutes, 25% of the sample remains. What is the half life of the sample? Pls say the formula how to calculate it

a)10 mins
b) 20 mins
c) 40 mins
d)80 mins
e) 160 mins

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