Re: The temperature of a photon ?
- From: Sam Wormley <swormley1@xxxxxxxxx>
- Date: Tue, 05 Sep 2006 09:38:17 GMT
Peter Christensen wrote:
Does it make sence to talk about the temperature of a photon? (-My own answer is no.)
It always applies that E = p*c (p is the momentum which depend only on the wavelength) for a photon. But as the speed of light is always c, there can't be a kinectic energy as for massive particles, where E_kin = 1/2 m*v^2 can be expressed as a measure of temperature for a particle.
I know, that a radiation profile (photons) can express the temperature of it's source, but I still don't think, that it will make sence to talk about a temperature for single photons, as it would do when talking about massive particles with E = E_kin = k_B*T.
Are there anybody who would like to try to define a temperature for a photon?
PC
When a cosmologist talks about the 'temperature' of a photon they are
basically describing the equivalent energy of a photon.
http://www.physlink.com/education/askexperts/ae210.cfm
Planck's Law
http://scienceworld.wolfram.com/physics/PlanckLaw.html
.
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