A radioactive sample consists of two distinct species having equal number of atoms initially. The mean life time of one species is $\tau$ and that of the other is $5 \tau$. The decay products in both cases are stable. A plot is made of the total number of radioactive nuclei as a function of time. Which of the following figures best represents the form of this plot

  • [IIT 2001]
  • A
    159-a4
  • B
    159-b4
  • C
    159-c4
  • D
    159-d4

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