The half-life of a radioactive element $X$ is equal to the mean life of another radioactive element $Y$. Initially, the number of atoms for both is the same. Then:
- A$X$ will decay faster than $Y$.
- B$Y$ will decay faster than $X$.
- C$Y$ and $X$ will decay at the same rate.
- D$X$ and $Y$ will always decay at the same rate.
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