Density of states of ideal gas and photon gas

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SUMMARY

The discussion focuses on deriving the density of states for an ideal gas and a photon gas. The energy equation for an ideal gas is given by E_n = (h_bar^2*pi^2)/(2mL^2)*n^2, while for a photon gas, the appropriate equation is E_n = (h_bar*pi*c/L)*n. Participants clarify that the first equation applies to ideal gases, while the second is specific to photon gases, which are massless bosons with two spin states. This distinction is crucial for accurately solving related physics problems.

PREREQUISITES
  • Understanding of quantum mechanics concepts, particularly energy quantization.
  • Familiarity with the properties of bosons and their statistical behavior.
  • Knowledge of the ideal gas law and its applications in statistical mechanics.
  • Basic proficiency in mathematical derivations involving physical equations.
NEXT STEPS
  • Study the derivation of density of states for various types of gases, including classical and quantum gases.
  • Learn about the statistical mechanics of photon gases and their implications in thermodynamics.
  • Explore the role of bosons in quantum statistics and their applications in modern physics.
  • Investigate the relationship between energy levels and wave functions in quantum systems.
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Students and professionals in physics, particularly those focusing on thermodynamics, quantum mechanics, and statistical mechanics, will benefit from this discussion.

ausdreamer
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Homework Statement



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

Homework Equations





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!
 
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Regular gas in a box derivation.
Note: photons are Bosons and massless with two spin states.
 
Last edited:
Thanks, this helped a lot :)
 

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