Question

What is the activity in $Ci$(curie) $1.0$ mole of plutonium-239?($t_{1/2}=24,000$ years)

• A. $1.49Ci$
• B. $14.9Ci$
• C. $5.513\times {10}^{11}Ci$
• D. none of these

Answer 1

The correct option is B $14.9Ci$

As we know, activity is $A=\lambda N=(0.693/24000\ast 365\ast 24\ast 3600)\ast 6.6\ast {10}^{23})=16.02Curie$