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.

A radioactive sample consists of two distinct species having equal num

1.	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.
Answer» Solution :The TOTAL NUMBER of atoms neigher remains constant (as in option (a) nor can EVER increase (as in option (B) and (c)). They will CONTINUOUSLY decrease with time.

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