A) 12 h
B) 16 h
C) 48 h
D) 192 h
Correct Answer: D
Solution :
\[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{t/T}}\Rightarrow \frac{1}{16}={{\left( \frac{1}{2} \right)}^{t/48}}\] \[\Rightarrow {{\left( \frac{1}{2} \right)}^{4}}={{\left( \frac{1}{2} \right)}^{t/48}}\Rightarrow t=192\ hour.\]
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