MadSci Network: Physics

Subject: Does a photon have a temperature ?

Date: Sat Jan 12 01:42:42 2002
Posted by Frank Lipsky
Grade level: grad (science) School: No school entered.
City: fountain hills State/Province: az Country: us
Area of science: Physics
ID: 1010817762.Ph

for a photon E=hf  and momentum p= E/c.We know photons pass thru almost empty 
space where the temperature is < 5 K( w/o  apparent loss of energy.
From thermodynamics DQ=DU +DW. If it does not interact with matter DW= 0
therefore DQ=U=E =hf =a constant for any single frequency.Is it really that 

Re: Does a photon have a temperature ?

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