Question

Plutonium decays with half time 24000 yr. If plutonium is stored after 72000 yr, the fraction of it that remains ______

• A. $\frac{1}{2}$
• B. $\frac{1}{9}$
• C. $\frac{1}{12}$
• D. $\frac{1}{8}$

Answer 1

Answer: (D)

$\frac{1}{8}$

Answer 2

The correct option is (D): $\frac{1}{8}$