SOLUTION: A 90 mg sample of a radioactive isotope has a half-life of 5 years. What is a function that relates the mass of the sample, m, to the elapsed time, t

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Question 1031278: A 90 mg sample of a radioactive isotope has a half-life of 5 years. What is a function that relates the mass of the sample, m, to the elapsed time, t
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
The working equation is m+=+90e%5E%28rt%29
==> 45+=+90e%5E%285r%29 ==> r+=+-ln2%2F5
==>