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: Density of states of ideal gas and photon gas

  1. Nov 6, 2011 #1
    1. The problem statement, all variables and given/known data

    I know how to derive the density of states for an ideal gas by using the energy equation:

    E_n = A*n^2, where A = (h_bar^2*pi^2)/(2mL^2)

    but what about for a 'photon gas'? Do I use the same energy equation as above, or the following:

    E_n = (h_bar*pi*c/L)*n

    2. Relevant equations

    3. The attempt at a solution

    I think I'd use the second equation, but solutions to the assignment said use the first equation. I'm confused!
  2. jcsd
  3. Nov 6, 2011 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

    Regular gas in a box derivation.
    Note: photons are Bosons and massless with two spin states.
    Last edited: Nov 6, 2011
  4. Nov 6, 2011 #3
    Thanks, this helped a lot :)
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook