A) 0
B) 12.5
C) 8
D) 25
Correct Answer: D
Solution :
\[{{t}_{1/2}}=10yrs,t=20yrs.\] \\[n=\frac{t}{{{t}_{1/2}}}=\frac{20}{10}=2\] \[N=\frac{{{N}_{o}}}{{{2}^{2}}}=\frac{1}{4}{{N}_{o}}=\frac{1}{4}\times 100%\,\text{of}\,{{N}_{\text{o}}}=25\].You need to login to perform this action.
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