Difficult
Two radioactive materials $A_1$ and $A_2$ have decay constants of $10 \lambda_0$ and $\lambda_0$. If initially they have the same number of nuclei,the ratio of the number of their undecayed nuclei will be $(1/e)$ after a time $t$. Find $t$.
- A$1/\lambda_0$
- B$1/(9\lambda_0)$
- C$1/(10\lambda_0)$
- D$1$
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