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Homework Help: Planck radiation formula

  1. Apr 12, 2005 #1
    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)

    Please answer me faster that you can.
     
  2. jcsd
  3. Apr 12, 2005 #2

    SpaceTiger

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    Just substitute:

    [tex]\lambda=\frac{c}{\nu}[/tex]

    and

    [tex]d\lambda=-\frac{c}{\nu^2}d\nu[/tex]

    That'll give you the frequency formula.
     
    Last edited: Apr 12, 2005
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