The time dependence of a physical quantity $P$ is given by $P = P_0 \exp(-\alpha t^2)$,where $\alpha$ is a constant and $t$ is time. The constant $\alpha$:
- Ais dimensionless
- Bhas dimensions $T^{-2}$
- Chas dimensions of $P$
- Dhas dimensions $T^2$
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