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Homework Help: Plank's law

  1. Nov 3, 2007 #1
    could you find the planks formulas transformation for high and low frequencies please.
     
  2. jcsd
  3. Nov 3, 2007 #2

    cristo

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    Last edited by a moderator: May 3, 2017
  4. Nov 3, 2007 #3
    planks law

    could you declare the planks formula through [tex]\lambda[/tex] please
     
  5. Nov 3, 2007 #4
    Last edited by a moderator: May 3, 2017
  6. Nov 3, 2007 #5

    cristo

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    You'll have to help me help you. Is the link I provided for you any use? If so, you (should) know a formula relating frequency and wavelength.
     
  7. Nov 3, 2007 #6

    cristo

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    There's a proof on that page!

    Note that you will probably know a lot more than me about this topic.
     
  8. Nov 3, 2007 #7
    planks law

    could you prove this
    [tex]\lambda_{max}[/tex]*T=constant=x
    and find x
    by planks formula?
     
  9. Nov 4, 2007 #8

    malawi_glenn

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    yes, that is Wiens displacement law.
    Just Do the "approximation" Wien "did" and find maximum. I.e remove the (-1) in the denominator in placks law.

    Wiens radiation law is for small wavelengths, and Rayleighs is for large. Planck is for all.
    Now try figure out WHY the (-1) is removed in order to get Wiens law from placks law.
     
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