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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)e^(-alpha t^(2))` , where `alpha` is a constant and `t` is time . Then constant `alpha` is//has

A

is dimensionless

B

has dimensions `[T^(-2)]`

C

has dimensions `[T^(2)]`

D

has dimensions of p

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The correct Answer is:
B
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