Let Q Represent a Mass of Radioactive Plutonium $\left( { } ^ { 239 } \mathrm { Pu } \right)$

Multiple Choice

Let Q represent a mass of radioactive plutonium $\left( { } ^ { 239 } \mathrm { Pu } \right)$ (in grams) ,whose half life is 24,100 years.The quantity of plutonium present after t years is $Q = 16 \left( \frac { 1 } { 2 } \right) ^ { t / 24,100 }$ .Determine the quantity present after 67,000 years.Round your answer to one decimal place. ​

A) 4.3 g
B) 3.3 g
C) 5.3 g
D) 2.3 g
E) 6.3 g