psi=A*exp[i*2*pi*S/h]

S is the Action

S=int(L)dt (1)

S = E * t - p * x

dS/st = E

dS/dp = -x ; dS/dx = -p

dS = 0

E = h * w / 2pi

P = h * k / 2pi

E * t - P * r = (h/2pi) * (wt - kr)

psi = A * exp [i(wt-kr)]

<psi|psi> = |A|^2