At time t = 0, a material is composed of two radioactive atoms A and B, where NA(0) = 2NB(0). The decay constant of both kind of radioactive atoms is λ. However, A disintegrates to B and B disintegrates to C. Which of the following figures represents the evolution of NB(t)/NB(0) with respect to time t ?
\(\left[ \begin{array}{l} {{\rm{N}}_{\rm{A}}}\left( {\rm{0}} \right){\rm{ = No}}{\rm{. of }}\,{\rm{A }}\,{\rm{atoms }}\,{\rm{at }}\,\,{\rm{t = 0 }}\\ {{\rm{N}}_{\rm{B}}}\left( {\rm{0}} \right){\rm{ = No}}{\rm{. of }}\,{\rm{B }}\,{\rm{atoms }}\,{\rm{at }}\,\,{\rm{t = 0}} \end{array} \right]\)
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