The decay constant of a radioisotope is $\lambda$. If $A_1$ and $A_2$ are its activities at times $t_1$ and $t_2$ respectively,what is the number of nuclei that have decayed during the time interval $(t_1 - t_2)$?
- A$A_1 t_1 - A_2 t_2$
- B$A_1 - A_2$
- C$(A_1 - A_2) / \lambda$
- D$\lambda (A_1 - A_2)$
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