Q: The time dependence of physical quantity p is given by $ \displaystyle p = p_0 e^{-\alpha t^2}$ , where α is a constant and t is the time. The constant α

(a) is dimensionless

(b) has dimensions [T^{–2}]

(c) has dimensions [T^{2}]

(d) has dimensions of p

Ans: (b)