Louis Victor Pierre Raymond, 7th Duc de Broglie was a French theoretical physicist and aristocrat known for his contributions to quantum theory. In his 1924 Ph.D. thesis, he postulated the wave nature
De Broglie in 1929
François-Marie, 1st duc de Broglie (1671–1745), ancestor of Louis de Broglie and Marshal of France under Louis XV
De Broglie presented at the Solvay conference 1927 (third from right in middle row).
Ondes et mouvements, 1926
Max Karl Ernst Ludwig Planck was a German theoretical physicist. He was awarded the 1918 Nobel Prize in Physics "for the services he rendered to the advancement of physics by his discovery of energy q
Planck in 1938
Plaque at the Humboldt University of Berlin: "Max Planck, discoverer of the elementary quantum of action h, taught in this building from 1889 to 1928."
Planck in 1918, the year he was awarded the Nobel Prize in Physics for his work on quantum theory.
From left to right: Nernst, Einstein, Planck, Millikan, and Laue at a dinner given by Laue in Berlin on 11 November 1931.