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Danish physicist Niels Bohr (1885-1962, left) talking to German physicist James Franck (1882-1964, centre) and H. M. Hansen (1886-1956, right). Bohr made numerous contributions to physics during his career, but it was his work on the structure of atoms that won him the 1922 Nobel Prize. Though associated with the Manhattan Project in World War II, he dedicated his later life to peaceful applications of atomic physics. Franck worked mostly on atomic physics, including what became known as the Franck-Condon principle. His work with Gustav Hertz, on electrons impacting atoms, confirming the Bohr model of the atom, won them the 1925 Nobel Prize in Physics. Franck protested against the Nazis and moved to the USA when they came to power. He also spoke out against the use of the atom bomb at Hiroshima.
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