A) A
B) B
C) C
D) D
Correct Answer: B
Solution :
Number of atoms undecayed \[N={{N}_{0}}{{e}^{-\lambda t}}\] Number of atoms decayed \[={{N}_{0}}-N={{N}_{0}}(1-{{e}^{-\lambda t}})\] Þ Decayed fraction \[f=\frac{{{N}_{0}}-N}{{{N}_{0}}}=1-{{e}^{-\lambda t}}\] i.e. fraction will rise up to 1, following exponential path as shown in graph .
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