Asked by Jessica

Iodine-131 is a radioactive isotope. After 8.00 days, 50.2% of the sample remains. What is the half life of 131-I?
Answered by DrBob222
ln(No/N) = kt
No = 100
N = 50.2
k = solve for this
t = 8 days

Then k = 0.693/t<sub>1/2</sub>
Substitute for k and solve for t 1/2.
Answered by jlj;l
79837we
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