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: WKB Approximation, tricky

  1. Dec 6, 2009 #1
    1. The problem statement, all variables and given/known data
    Using the WKB approximation, estimate the lifetime of an electron in the ground state of a 1D quantum well with 10 nm width, surrounded from both sides by 0.3 eV high and 8nm wide barriers.

    2. Relevant equations
    Hint: Estimate the tunneling probability and find the "tunneling attempt frequency" assuming that the electron moves back and forth in the quantum well with the velocity, v = sqr(2E/m)

    3. The attempt at a solution
    This is from a collection of practice questions our professor provided to help us prepare for our final exam. I'm not great at this WKB (semi-classical approximation) method. We are really just looking for the start of this problem since we are having trouble visualizing it. Any help would be much appreciated.
  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