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: Electron energy levels

  1. Apr 15, 2006 #1


    User Avatar
    Gold Member

    The question is:

    So I have the equation to find the energy in an infinite well…

    [tex] \[
    E_n = n^2 \frac{{\pi ^2 (\hbar c)^2 }}{{2mc^2 L^2 }} \\
    L = 2*10^3 nm \\
    m = 5.11*10^5 eV \\
    \hbar c = 197.33eV*nm \\

    Using this, I find n=1 to equal 9.40*10^-8 eV

    The book says im good there.

    The problem is when I have to find the second energy level. I figured you use n=2 which means its just 2^2 or 4 times the energy but the book says its just 2 times the energy of the first energy level. What am I not understanding here?
  2. jcsd
  3. Apr 20, 2010 #2
    I'm pretty sure the book made a mistake. For n=2, E2 = 4*E1 = 3.8 X 10^-7. I double checked with cramster, and that's how it was done there also.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook