SOLUTION: At time t=0, 480 grams of an isotope with a half-life of 30 hours is present. How much will have elapsed when only 15 grams remain?

Algebra ->  Exponential-and-logarithmic-functions -> SOLUTION: At time t=0, 480 grams of an isotope with a half-life of 30 hours is present. How much will have elapsed when only 15 grams remain?      Log On

Notice that   = 32 = .


It means that the time elapsed is 5 (five) half-lives.


5 half-lives = 5*30 hours = 150 hours.    ANSWER