Homework Help: chemistry

Posted by Urgent Help on Thursday, January 10, 2013 at 1:16am.

Strontium-90 decays through the emission of beta particles. It has a half-life of 29 years. How long does it take for 80% of a sample of strontium-90 to decay?
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chemistry - DrBob222, Thursday, January 10, 2013 at 12:19pm
k = 0.693/t_1/2
ln(No/N) = kt

Use No = 100
N = 20
k from above
solve for t in years.

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