1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Momentum Operator and Wavefunction problem

  1. Nov 24, 2004 #1
    Okay this should be fairly easy, not really sure why it's not working for me.

    Suppose a particle moving along the x-axis is in a state with a wavefunction psi=cos(ax). Determine whether (i) the linear momentum and the (ii) kinetic energy of the particle has a single well-define value. If so what is it?

    The operator we are given is P(sub)x=(h/(2πi))d/dx. I know to set it up using the Hpsi= Epsi. What I don't know is what to use for E. Classically, we have used just T + V and I know that T=(P(sub)x)^2/(2m) . But what about V? Can I leave it out? Is it not important?

    Once, I get that, I can find out if it has a sharp observable for both of those.

    Any help is greatly appreciated. Thanks in advance.

  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted