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Planck's blackbody law

  1. May 29, 2012 #1
    Screenshot2012-05-29at61539AM.png

    Screenshot2012-05-29at61109AM.png

    I don't see how this follows.
     
  2. jcsd
  3. May 29, 2012 #2

    phyzguy

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    Science Advisor

    What don't you see? If you do the substitution, the h's cancel, one of the c's cancel, and one of the lambda's cancel, leaving the result. What are you missing?
     
  4. May 29, 2012 #3

    jtbell

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    Staff: Mentor

    If your problem is with the approximation in the second line, consider the power series for ex:

    $$e^x = 1 + x + \frac{x^2}{2!} + \frac{x^3}{3!} + ...$$
     
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