A) 4 days
B) 12 days
C) 18 days
D) 24 days
Correct Answer: C
Solution :
Here : Half life\[{{T}_{1/2}}\]= 3.6 days Amount left after time t, \[N=\frac{1}{32}\times {{N}_{0}}\] Number of half lives is given by \[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{n}}\] or \[\frac{\frac{{{N}_{0}}}{32}}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{n}}\] or \[\frac{1}{32}=\frac{1}{{{2}^{n}}}\] or \[n=5\] or \[\frac{t}{{{t}_{1/2}}}=5\] Hence, time of decay
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