A) Whole
B) Half
C) One-fourth
D) Three-fourth
Correct Answer: D
Solution :
\[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{n}},\ n=2\Rightarrow \frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{2}}=\frac{1}{4}\] So disintegrated part \[=1-\frac{N}{{{N}_{0}}}=1-\frac{1}{4}=\frac{3}{4}\]
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