A) 8 hours
B) 24 hours
C) 6 hours
D) 4 hours
Correct Answer: A
Solution :
\[N={{\left[ \frac{1}{2} \right]}^{n}}\times {{N}_{o}}\]= 125 mg =\[{{\left( \frac{1}{2} \right)}^{n}}\times 1000\,mg\] \[{{\left( \frac{1}{2} \right)}^{n}}=\frac{125}{1000}=\frac{1}{8}\] \[{{\left( \frac{1}{2} \right)}^{n}}={{\left( \frac{1}{2} \right)}^{3}},n=3,\] so number, of \[{{t}_{1/2}}=3\] Total time = 24 hours, Half-life time \[=\frac{24}{3}\]\[=8\,\text{hours}\].
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