- #1
castlemaster
- 38
- 0
Homework Statement
Mean value and deviation of momentum for this wave function:
[tex]\Psi(x,0)=cos^2(kx/L)e^{2ikx/L}[/tex]
Homework Equations
The Attempt at a Solution
I express the cos^2 in terms of exponencials:
[tex]\Psi(x,0)=(1/2)+(1/4)e^{2ikx/L}+(1/4)e^{4ikx/L}[/tex]
the momentum of each plane wave is p=hk
How do I get the mean value and the deviation of the momentum?