Answer
The fraction of a sample that will remain after three half-lives is $~~\frac{1}{8}$
Work Step by Step
We can find the fraction of a sample that will remain after three half-lives:
$(\frac{1}{2})^3 = \frac{1}{8}$
The fraction of a sample that will remain after three half-lives is $~~\frac{1}{8}$
