Simple proof of Planck's radiation distribution law?

[Shan K]

Can anyone give me a simple proof of Planck's radiation distribution law ?

 

[mfb]

There are no proofs in physics, but you can derive it based on some theories.
"Simple" is relative, but not everything can be derived in 3 lines.

 

[andrien]

this link provide the description from a scratch so you can try it (number of modes per unit volume)
https://docs.google.com/viewer?a=v&q=cache:Puk40rWb-O0J:www.mrao.cam.ac.uk/teaching/sqp/qsp_chapter10.pdf+planck+radiation+law+derivation&hl=en&gl=in&pid=bl&srcid=ADGEESjdRaBCMC0f72ybB1O13_8MUflvdzMzNpR_HqUG4krWtOq90QRlheMQmN78fwOpuHZ27EAg-KZWyZIJqcc_Xg-LAH-mmrSOZd6zAxwXn2mVw4Px4a_T-mJL_OvwyGf8uevDYfzT&sig=AHIEtbQdTE98YwCHGBH-0pn_ic2eTuS3Xw
otherwise I think a simple proof is given in feynman lectures vol. 1.

 

[Shan K]

Thanx .