- #1

Ed Quanta

- 297

- 0

## Homework Statement

6) A particle in the infinite square well has the initial wave function

Ψ(x,0)= Ax when 0<=x<=a/2

Ψ(x,0)= A(a-x) when a/2<=x<=a

a) Sketch Ψ(x,0), and determine the constant A.

b) Find Ψ(x,t)

c) Compute <x> and <p> as functions of time. Do they oscillate? With what frequency?

## Homework Equations

Schrodinger Equation, Equations for expectation values

## The Attempt at a Solution

Part (a) wasn't a problem. I solved for the normalization constant A by setting the integral of the norm of the wave function equal to zero.

A = 2 * sqrt(3/a^3)

Part (b) also wasn't a problem as Ψ(x,t)=Ψ(x,0)exp(-iEt/h)

Part (c) confuses me a little. I know how to calculate <x> and <p> using the equations <x> = ∫ψ*(x)xψ(x)dx and <p> = ∫ψ*(x)(h/i)d/dx(ψ(x))dx. But the as functions of time confuses me. Won't the exp(-iEt/h) cancel out when multiplied by its conjugate. If this is true, then how can <x> and <p> oscillate? How could they oscillate with any frequency? Any help would be appreciated.