The shape of the blackbody radiation spectrum was known in the 19th century from experimental measurements, and before the theoretical discovery of Planck's law.

At those times, how did people manage to measure the intensity distribution of the blackbody spectrum in its different frequency windows? What sort of technology available at that time was being used to measure intensities of the UV, IR, and visible part of the spectrum? Thanks!

  • 2
    $\begingroup$ Wikipedia reviews technology used in early experiments in the history section. Please refine the question if you are interested in something more specific. $\endgroup$
    – Conifold
    Sep 24, 2021 at 16:50


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.