math
posted by Eric .
A 10 kg quantity of a radioactive isotope decays to 3 kg after 17 years. Find the decay constant of the isotope.

math 
drwls
Solve this for k:
3 = 10 e^(kt)
where t = 17 years
ln (3/10) = 17k
k = 0.0798 y^1
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