The half-life period of $Pb^{210}$ is $22 \ years$. If $2 \ g$ of $Pb^{210}$ is taken,then after $11 \ years$ how much of $Pb^{210}$ will be left in $g$?
- A$1.41$
- B$2.43$
- C$3.44$
- D$4.46$
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