A) 15 minutes
B) 30 minutes
C) 45 minutes
D) 1 hour
Correct Answer: B
Solution :
\[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{t/T}}\]\[\Rightarrow \left( \frac{1}{16} \right)={{\left( \frac{1}{2} \right)}^{2/T}}\Rightarrow {{\left( \frac{1}{2} \right)}^{4}}={{\left( \frac{1}{2} \right)}^{2/T}}\] \[\Rightarrow T=0.5\ hour\]= 30 minutes.
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