Q.

The time dependence of a physical quantity p is given by P = P0 exp (- αt2) [ where α is a constant and t is time]. The constant α :

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a

is dimensionless

b

has dimensions [T-2]

c

has dimensions [T2]

d

has dimensions of P

answer is B.

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Detailed Solution

[α]=1[Time]2=T-2
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The time dependence of a physical quantity p is given by P = P0 exp (- αt2) [ where α is a constant and t is time]. The constant α :