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The time dependence of a physical quanti...

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 `

A

is dimensionless

B

has dimensions `[T^-2]`

C

has dimensions `[T^2]`

D

has dimensions of p

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