The decay constant of a radioactive sample is $\lambda$. The half-life and mean life of the sample are respectively
- A$\frac{1}{\lambda}, \frac{\ln 2}{\lambda}$
- B$\frac{\ln 2}{\lambda}, \frac{1}{\lambda}$
- C$\lambda \ln 2, \frac{1}{\lambda}$
- D$\frac{\lambda}{\ln 2}, \frac{1}{\lambda}$
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