2.)energy Density Of Radiations

[GAGS]

Hello,QUERY2
While studying blackbody radiations I was unable to understand the term so used ”ENERGY DENSITY OF RADIATION”. I have heard of density of matter,but how we can define this?

 

[ZapperZ]

Hello,QUERY2
While studying blackbody radiations I was unable to understand the term so used ”ENERGY DENSITY OF RADIATION”. I have heard of density of matter,but how we can define this?

If you know the number of photons per unit volume, and each photon carries a particular amount of energy, you now have the amount of energy per unit volume. That's energy density of radiation.

If you have taken classical E&M, there's a similar definition of energy density for E and B fields.

Zz.