Difficult
The 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 $t$ equal to:
- A$\frac{1}{10 \lambda}$
- B$\frac{1}{11 \lambda}$
- C$\frac{11}{10 \lambda}$
- D$\frac{1}{9 \lambda}$
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