The time dependence of a physical quantity $P$ is given by $P = P_0 e^{-\alpha t^2}$,where $\alpha$ is a constant and $t$ is the time. Then the constant $\alpha$ has:
- ADimensionless
- BDimensions of $T^{-2}$
- CDimensions of $P$
- DDimensions of $T^2$
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