I have some questions regarding the first two sections Einstein's paper. I'd really appreciate some guidance.(adsbygoogle = window.adsbygoogle || []).push({});

The paper can be found here:

http://lorentz.phl.jhu.edu/AnnusMirabilis/AeReserveArticles/eins_lq.pdf

In section 1 of the paper, he considers a volume of gas surrounded by reflective walls. He goes on to derive what seems to me to be the Rayleigh-Jeans law using "Maxwell theory" and "kinetic gas theory".

[tex]\rho_\nu = \frac{R}{N} \frac{8\pi{\nu}^2}{L^3}T[/tex]

R/N = k (boltzmann constant) and L = c

Then in section 2... he writes:

"We shall show in the follow that determination of elementary quanta given by Mr. Plank is, to a certain extent, independent of the theory of "black-body radiation" constructed by him.

He writes Planck's formula:

[tex]\rho_\nu = \frac{\alpha {\nu}^3}{e^{\beta\nu/T}-1}[/tex]

and then shows that at large [tex]T/\nu[/tex] this leads to the rayleigh jeans law.

It seems like what Einstein's showing is... first...

"maxwell theory" and "kinetic gas theory" => Rayleigh Jeans Law

then

"planck's formula" => Rayleigh Jeans Law

Is this to demonstrate that Planck's formula is not just applicable to blackbodies? But I thought both of these were already known. It seems to me that there is something significant Einstein's getting at here, but I'm missing it.

I'd appreciate any help.

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Understanding Einstein's photoelectric effect paper

**Physics Forums | Science Articles, Homework Help, Discussion**