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October 11th, 2009, 02:14 PM   #1
 
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Half life

Need some help on solving this problem:
If 17% of a radioactive substance decays in 5 hours, what is the half life of the substance?

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October 11th, 2009, 02:56 PM   #2
 
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Re: Half life

Google [half life formulas]
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