Two radioactive materials $X_1$ and $X_2$ have decay constants $10 \lambda$ and $\lambda$ respectively. If initially they have the same number of nuclei,then the ratio of the number of nuclei of $X_1$ to that of $X_2$ will be $1 / e$ after a time:
- A$1 / (10 \lambda)$
- B$1 / (11 \lambda)$
- C$11 / (10 \lambda)$
- D$1 / (9 \lambda)$
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