#### 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)

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#### SpaceTiger

Staff Emeritus
Gold Member
elessar_telkontar said:
The one for wavelength I have found is:

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

Just substitute:

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

and

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

That'll give you the frequency formula.

Last edited:

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