A) 2 seconds
B) 4 seconds
C) 5 seconds
D) 6 seconds
Correct Answer: C
Solution :
\[N={{N}_{0}}{{\left( \frac{1}{2} \right)}^{t/T}}\Rightarrow \frac{{{N}_{0}}}{64}={{N}_{0}}{{\left( \frac{1}{2} \right)}^{30/T}}\]\[\Rightarrow T=\frac{30}{6}=5\sec \]
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