1. Apr 12, 2005

### elessar_telkontar

I'm taking a course on astrophysics, and at this time I get the astrophysics of stars. In this section, I have to use the planck radiation formula, but I have got it for the frecuency of radiation. What's the one for wavelenght? I have found one but I tried to reconstruct the one for frecuencies but I can't do it:

The one for wavelength I have found is:

Bf(T)=((2hc2)/(l5))(1/ehc/klT-1)

2. Apr 12, 2005

### SpaceTiger

Staff Emeritus
Just substitute:

$$\lambda=\frac{c}{\nu}$$

and

$$d\lambda=-\frac{c}{\nu^2}d\nu$$

That'll give you the frequency formula.

Last edited: Apr 12, 2005