A) \[58\]
B) \[10\,S\]
C) \[20\,S.\]
D) \[30\,S.\]
Correct Answer: B
Solution :
As, \[{{2}^{n}}=64\,\,\,\Rightarrow \,\,\,n=6\] \[\therefore \] \[{{T}_{1/2}}=\frac{total\,\,time}{Number\,\,of\,\,half-lives}\] \[=\frac{60}{6}=10S.\]
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