A) 1
B) \[\frac{2}{3}\]
C) \[\frac{7}{8}\]
D) \[\frac{5}{8}\]
Correct Answer: C
Solution :
\[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{n}}={{\left( \frac{1}{2} \right)}^{15/5}}={{\left( \frac{1}{2} \right)}^{3}}\] \[\frac{N}{{{N}_{0}}}=\frac{1}{8}\] Fraction decayed \[={{N}_{0}}-N={{N}_{0}}-\frac{{{N}_{0}}}{8}\] \[=\frac{8{{N}_{0}}-{{N}_{0}}}{8}=\frac{7}{8}{{N}_{0}}\]
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