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

question 67

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

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