Two radioactive substances $A$ and $B$ have decay constants $5 \lambda$ and $\lambda$ respectively. At $t=0$,they have the same number of nuclei. The ratio of the number of nuclei of $A$ to those of $B$ will be $(1/e)^2$ after a time interval of:
- A$1/(4 \lambda)$
- B$4 \lambda$
- C$2 \lambda$
- D$1/(2 \lambda)$
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