Half-life of X equals the mean life of Y: compare their decay

1. A.
   $x$-will decay faster than $y$.
2. B.
   $y$ - will decay faster than $x$.
3. C.
   $x$ and $y$ have same decay rate initially and later on different decay rate.
4. D.
   $x$ and $y$ decay at the same rate always.

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1. A.
   $\lambda_{A} = \lambda_{B}$
2. B.
   $\lambda_{A} = 2\lambda_{B}$
3. C.
   $\lambda_{A} = \lambda_{B}\ln2$
4. D.
   $\lambda_{A}\ln2 = \lambda_{B}$

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