A free particle of mass m moves along the x–axis. It is described by the wave function \(\psi(x)=\frac{1}{(2 \pi \alpha)^{1 / 4}} \exp \left[-\frac{x^2}{4 \alpha^2}+i x\right]\) (α = constant)
The expectation value of the momentum in this state is :
1
ħα
2
ħ√α
3
ħ/α
4
ħ/√α