1. Apr 11, 2004

### Callisto

Hi, can anybody help me with this problem?

Planck's law of radiation for a blackbody radiator quantifies the relation between it's radiative flux and wavelength at a particular temperature.
given by:
F(w)=C1/[w^5(exp(C2/wT)-1]

where, w=wavelength, C1 and C2 are constants and T is the absolute temperature.

My problem is , I have to show that the peak radiative flux of the Planck spectrum varies as the fourth power of temperature.
Do i need to do some integration of Plancks law to show this?
If so, where do i start?

2. Apr 12, 2004

### chroot

Staff Emeritus
I think you mean the "total radiative flux," not the "peak radiative flux."

If so, simply integrate your formula over all values of wavelength.

Here's a page that might help:

http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/stefan2.html#c1

- Warren