SOLUTION: The half life of a radioactive isotope is 394 days. A sample of this isotope is 10 grams. a. Find the model, A=Aoe^kt, that describes the decay of this sample. b. How long will

Question 866024: The half life of a radioactive isotope is 394 days. A sample of this isotope is 10 grams.
a. Find the model, A=Aoe^kt, that describes the decay of this sample.
b. How long will it take the sample to be 3.5 grams?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!



Hi

The half life of a radioactive isotope is 394 days. k = ln(.5)/-394 = .0018

A sample of this isotope is 10 grams.  A = 10e^(-.0018t)

b.,   t = ln(.35)/(-.0018) 

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