1. Not finding help here? Sign up for a free 30min 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 Physics Tunneling

  1. Oct 11, 2015 #1
    1. The problem statement, all variables and given/known data
    The work function (energy needed to remove an electron) of gold is 5.1 eV. Two pieces of gold (at the same potential) are separated by a distance L.

    For what value of L will the transmission probability for an electron to cross from one to the other be T≈ 10-3? Assume that G = 1 in the formula for the tunneling probability.

    fig14.gif
    (a) L = 0.001 nm
    (b) L = 0.02 nm
    (c) L = 0.1 nm
    (d) L = 0.3 nm
    (e) L = 4 nm

    2. Relevant equations
    T= Ge^(-2KL)
    K=sqrt(2m/h^2 * (U-E))

    3. The attempt at a solution
    I have my final tomorrow, this is a practice exam. I tried to solve for K using 5.1eV for (U-E) and then solve for L but I can't figure it out.
     
  2. jcsd
  3. Oct 12, 2015 #2

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    The approach is good, so unless you show your work there is no way to tell what went wrong.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Quantum Physics Tunneling
  1. Quantum Tunneling (Replies: 5)

Loading...