October 19, 1900, Max Planck discovers Planck's law

On this day (October 19), 1900, at his home in Grunewald, on the outskirts of Berlin (Germany), Max Planck discovers the law of black body emission (Planck's law).
Max Karl Ernst Ludwig Planck was born in Kiel on April 23, 1858, he was a physicist and mathematician. He is considered the founder of quantum theory (which is the branch of physics which studies nature at small spatial scales). He was awarded the Nobel Prize in Physics in 1918 "for the role he played in advancing physics with the discovery of quantum theory."
Planck's hypothesis of that energy is radiated and absorbed in discrete "quanta" (or energy packets) precisely matched the observed patterns of black body radiation (it is a theoretical object that absorbs all the light and all the radiant energy that falls on it, constituting an idealized physical system for the study of the emission of electromagnetic radiation.)

Planck's law has the following important features:

  • The emitted radiation varies continuously with wavelength.
  • At any wavelength, the magnitude of the emitted radiation increases with increasing temperature.
  • The spectral region in which the radiation is concentrated depends on the temperature, and comparatively more radiation appears at shorter wavelengths as the temperature increases (Wien's displacement law ).

How curious to comment that in honor of Max Planck it was baptized:

  • In 2009, the European Space Agency launched Planck, a two-ton satellite as part of its Horizon 2000 science program.
  • In 1970 the Planck crater and the Vallis Planck valley on the Moon.
  • In 1949 the Max Planck Society, the successor to the Kaiser Wilhelm Gesellschaft.
  • In 1938 the Max Planck Institute for Physics, formerly named after Kaiser Wilhelm.
  • In 1938 the asteroid (1069) Planckia.
  • In 1929 the Max Planck Medal, the highest award in theoretical physics from the German Physical Society.


- what are you doing Plank?
- I study the radiation of a black body
- a black body?
- sounds really bad
- no, I'll explain. A body...
- sounds like a vice of yours
- no... let me explain...
- I don't want to know about your perversions
- no, the perversions are in the black body
- see how there are perversions!
- nooooooo...
- pervert
- let me...

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