After three half lifes, the fraction of a radioactive material that has decayed is
- \(\frac{1}{8}\)
- \(\frac{1}{3}\)
- \(\frac{2}{3}\)
-
\(\frac{7}{8}\)
The correct answer is: D
Explanation
I = \(\frac{1}{2}\) \(\Rightarrow\) \(\frac{1}{4}\) \(\Rightarrow\) \(\frac{1}{8}\)Fraction decayed = 1 - \(\frac{1}{8}\)
= \(\frac{7}{8}\)