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Thread: History of Planck's equation(s)

  1. #1 History of Planck's equation(s) 
    Cool Dude ostkef's Avatar
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    I've only got a layman understanding of this.

    Why did Planck find quantization necessary and how did he come up with the equation E = hf?


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  3. #2  
    Cool Dude ostkef's Avatar
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    Quote Originally Posted by PhDemon View Post
    He came up with the idea of quantization to explain the black body radiation problem (the ultraviolet catastrophe):

    https://en.wikipedia.org/wiki/Ultraviolet_catastrophe

    He proposed that if electromagnetic radiation was quantized with energy proportional to frequency the probelm would be solved and his theory agreed with the experimental data if the constant of proportionality was h (now called Plancks constant).
    I'm looking for the math which demonstrates the need for quantization but I can't seem to find it.


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  4. #3  
    Cool Dude ostkef's Avatar
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    Quote Originally Posted by PhDemon View Post
    Look in the links to the wiki article I posted or search for classsical and quantum treatments of black body radiation.
    that's great, mate.
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  5. #4  
    Brassica oleracea Strange's Avatar
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    Neither that page, not the "quanta" page it links to provide any more detail on what "really" motivated Plankc.

    I believe it was the problem of electrons orbiting atoms. In classical electromagnetism, these continuously accelerating charges should radiate and lose energy. They don't (otherwise atoms wouldn't exist). Planck suggested they could only lose energy is discrete packets and thus would not lose energy.

    But it was black body radiation that provided the value for h.
    ei incumbit probatio qui dicit, non qui negat
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  6. #5  
    Cool Dude ostkef's Avatar
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    one of the wiki links is not bad.
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