A) 11520 years
B) 2880 years
C) 1440 years
D) 17280 years
Correct Answer: A
Solution :
\[25={{\left[ \frac{1}{2} \right]}^{n}}\times 100,{{\left[ \frac{1}{2} \right]}^{n}}=\frac{25}{100}=\frac{1}{4}={{\left[ \frac{1}{2} \right]}^{2}}\] n = 2, No. of half lives = 2 so time required = \[2\times 5760=11520\,\,yr.\]You need to login to perform this action.
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