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I = P/A what is P?

  1. Sep 23, 2014 #1
    Hello!

    I just started learning about Stefan-Boltzmann's law and I'm stuck on the word for P in Intensity = P/Area.

    Also, does anyone have a quick and easy explanation for how Max Planck started quantum mechanics by saying energy is quantized and how the equation E = nhf says so?
     
  2. jcsd
  3. Sep 23, 2014 #2

    Doc Al

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    Staff: Mentor

    How about Power!
     
  4. Sep 23, 2014 #3
    Oh lord ha ha, thank you!
     
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