A) 16 h
B) 6 h
C) 10h
D) 12h
Correct Answer: D
Solution :
\[{{R}_{t}}={{R}_{0}}{{\left( \frac{1}{2} \right)}^{n}}\] \[\therefore \] \[1=64{{\left( \frac{1}{2} \right)}^{n}}\] \[\Rightarrow \] \[\frac{1}{64}={{\left( \frac{1}{2} \right)}^{n}}\] \[\Rightarrow \] \[{{\left( \frac{1}{2} \right)}^{6}}={{\left( \frac{1}{2} \right)}^{n}}\] \[\Rightarrow \] \[n=6\] \[\therefore \]Time required \[=n{{T}_{1/2}}\] \[=6\times 2=12h\]
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