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: Infinite potential well

  1. Oct 29, 2016 #1
    1. The problem statement, all variables and given/known data
    Determine what colors of visible light would be absorbed by electrons in an infinite well, N = 3.1 nm. The effective mass for an electron in GaAs is one-fifteenth of the standard electron mass.

    2. Relevant equations
    En = πh2/[2*N2*me/15]*n2

    L = nλ/2

    Ψ = √(2/L)sin(nπx/L)

    3. The attempt at a solution
    En = 5.4624*10-27*n2 ...but the units do not look correct, and I don't know how to go about the rest of the problem. I thought it had something to do with eventually finding the wavelength.
  2. jcsd
  3. Oct 29, 2016 #2
    check your calculation and putting up the values you get E(n) = E(0) . n^2
    i think you have to search for the visible range absorption trying from n=1 to n2 value which yields say yellow wavelength photon energy. then if n2 comes out to be whole number one can think of quantum absorption;
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted