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1 results

  • 15 - Planck’s Theory of Black-Body Radiation

  • from Case Study V - The Origins of the Concepts of Quantisation and Quanta
  • Malcolm S. Longair, University of Cambridge
  • Book:
    Theoretical Concepts in Physics
    Published online:
    27 March 2020
    Print publication:
    16 April 2020, pp 373-388

  • Summary

    Planck immediately set about attempting to understand the significance of his formula for black-body radiation. He began by using Boltzmann's procedure in statistical mechanics, an approach he had previously rejected, but then adopted empirically a definition of the entropy of the oscillators which introduced the concept of quantisation. HIs derivation was not understood by his contemporaries, including Einstein, because of the lack of a theoretical motivation for the definition of entropy. Despite a major effort to understand his formula, Planck found no classical solution to the meaning of h, Planck's constant.