A) 500 days
B) 125 days
C) 25 days
D) 5 days
Correct Answer: D
Solution :
\[N={{\left[ \frac{1}{2} \right]}^{n}}\times {{N}_{o}}\] \[1.25={{\left[ \frac{1}{2} \right]}^{n}}\times 10\] \[{{\left[ \frac{1}{2} \right]}^{n}}=\frac{1.25}{10}=\frac{1}{8}={{\left[ \frac{1}{2} \right]}^{3}},\,n=3\] Half-life time = \[\frac{15}{3}=\]5 days.
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