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2 results

  • 6 - The Black Body and Its Radiation

  • David F. Gray
  • Book:
    The Observation and Analysis of Stellar Photospheres
    Published online:
    05 January 2022
    Print publication:
    16 December 2021, pp 106-114

  • Summary

    The black body plays a central role in stellar atmospheres in describing the radiation field within the photosphere.The equation describing the photon distribution is Planck's law.Because the characteristics of black-body radiation are completely determined by the temperature of the black body, it forms a fundamental radiation standard, used to calibrate absolute radiant energy received from stars.

  • 14 - 1895–1900: Planck and the Spectrum 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 348-372

  • Summary

    Max Planck was an expert on classical thermodynamics and turned his attention to the understanding of black-body radiation in 1895. He worked out the form the radiation formula had to have from the emission and absorption of radiation of a dipole in thermal equilibrium with the radiation it emits. The formula related the mean energy density of radiation to the average energy of the oscillator. Using new precision measurements of the black-body spectrum, Planck derived the primitive form of the black-body spectrum by a combination of theory and the empirical results of experiment, but without any physical interpretation of the significance of the formula.