The time dependence of a physical quantity P is given by P=P0e−αt2, where α is a constant and t is time. Then constant α is / has
Dimensionless
Dimensions of T−2
Dimensions of P
Dimensions of T2
A
Dimensions of P
B
Dimensions of T2
C
Dimensions of T−2
D
Dimensionless
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Solution
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P=P0e−αt2
αt2 must be dimension less in e−αt2
⇒dim(αt2)=M0L0T0⇒dim(α)=M0L0T0T2
∴dim(α)=M0L0T−2
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