Photon gas

1. Dec 19, 2007

Fys

1. The problem statement, all variables and given/known data
1.Show that
$$PV^Y$$ is a constant for adiabatic,quassistatic expansion of a photongas and determine Y
2. Show the same for full degenerate gas of fermions at T=0

2. Relevant equations

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

Plz help thx

2. Dec 20, 2007

Hootenanny

Staff Emeritus
Do you have any idea's whatsoever? You must have something in your lecture notes...