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!

Quantum Tunneling

  1. Apr 28, 2009 #1
    1. The problem statement, all variables and given/known data
    A 10eV electron is incident on a potential barrier of height 25eV and width 1nm. Estimate (order of magnitude) the probability that the electron will tunnel through the barrier, repeat your calculations for a barrier of 01.nm

    2. Relevant equations

    3. The attempt at a solution
    E=10eV=1.6x10^-18J, V=25eV=4x10^-18J



    the answer is meant to be 9.2x10^-9 or 4.95x10^-13???? sorry, my book says 4.95 and the lecturers notes say 9.2... doesnt matter, coz im way way off...

    please can someone help me where i am going wrong?
  2. jcsd
  3. Apr 28, 2009 #2
    sorry about the latex the x is multiply
  4. Apr 28, 2009 #3
    plz anyone?
  5. Apr 28, 2009 #4


    User Avatar
    Science Advisor
    Gold Member

    Well, the only thing I see is that instead of hbar you used h in your calculations. hbar is a factor of 2pi smaller than h.
  6. Apr 28, 2009 #5
    omg oops, thanks
  7. Apr 29, 2009 #6
    still have wrong answer, anyone know y?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Quantum Tunneling