A) 10 days
B) 20 days
C) 40 days
D) None of these
Correct Answer: A
Solution :
\[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{n}}\] Þ \[\frac{1}{16}={{\left( \frac{1}{2} \right)}^{4}}={{\left( \frac{1}{2} \right)}^{n}}\] Þ n = 4. Also \[n=\frac{t}{{{T}_{1/2}}}\] Þ \[{{T}_{1/2}}=\frac{40}{4}=10\,days\]
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