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Planck's revolutionary discovery, one of the most influential in all of science, was that a resonator could emit energy in discrete units, or quanta.  The energy emitted by a resonator of frequency '''''ν''''' is '''''hν''''', where "'''''h'''''" is a universal constant that is now called Planck's constant.  This explanation resolved important discrepancies between theory and observations, and helped lay a foundation for the development of [[quantum mechanics]].

Planck's revolutionary discovery, one of the most influential in all of science, was that a resonator could emit energy in discrete units, or quanta.  The energy emitted by a resonator of frequency '''''ν''''' is '''''hν''''', where "'''''h'''''" is a universal constant that is now called Planck's constant.  This explanation resolved important discrepancies between theory and observations, and helped lay a foundation for the development of [[quantum mechanics]].

Planck's research in quantum theory was published in the ''Annalen der Physik'', and his work was summarized in the books ''Thermodynamik''  (Thermodynamics) (1897) and ''Theorie der Wärmestrahlung'' (Theory of heat radiation) (1906).<ref> [http://nobelprize.org/nobel_prizes/physics/laureates/1918/planck-bio.html Biography]</ref>

Planck's research in quantum theory was published in the ''Annalen der Physik'', and his work was summarized in the books ''Thermodynamik''  (Thermodynamics) (1897) and ''Theorie der Wärmestrahlung'' (Theory of heat radiation) (1906).<ref>{{cite web |url=http://nobelprize.org/nobel_prizes/physics/laureates/1918/planck-bio.html|title=Biography|publisher=Nobelprize.org}}</ref>

Planck was awarded the [[Nobel Prize]] for physics in 1918.<ref>The Earth and Its Peoples A Global History, Bulliet et al, 2005</ref>

Planck was awarded the [[Nobel Prize]] for physics in 1918 “in recognition of the services he rendered to the advancement of Physics by his discovery of energy quanta.”<ref>The Earth and Its Peoples A Global History, Bulliet et al, 2005</ref><ref>{{cite web|title=Planck, Physicist|author=Raymond J. Seeger|publisher=The American Scientific Affiliation|date=December 1985|url=http://www.asa3.org/ASA/PSCF/1985/JASA12-85Seeger2.html|accessdate=2012-11-04}}</ref>

 

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Planck's son was executed in 1945 for his part in an unsuccessful attempt to assassinate [[Adolf Hitler|Hitler]] in 1944.

Planck's son was executed in 1945 for his part in an unsuccessful attempt to assassinate [[Adolf Hitler|Hitler]] in 1944.

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