SOLUTION: The half-life of Zn-71 is 2.45 minutes. At t=0, there were y⁰ grams of Zn-71, but only 1/256 of this amount remains after some time. How much time(t) has passed?

Algebra ->  Exponential-and-logarithmic-functions -> SOLUTION: The half-life of Zn-71 is 2.45 minutes. At t=0, there were y⁰ grams of Zn-71, but only 1/256 of this amount remains after some time. How much time(t) has passed?      Log On

 = .


So we conclude that 8 half-life periods passed from t= 0.


8 half-lives is 8*2.45 minutes = 19.6 minutes = 19 minutes and 36 seconds.    ANSWER