Niels Bohr and Richard Tolman

Niels Bohr and Richard Tolman

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Credit: Princeton Photo Service/ National Archives and Records Administration, courtesy AIP Emilio Segre Visual Archives /SCIENCE PHOTO LIBRARY

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Caption: Danish physicist Niels Bohr (1885-1962, left) drinking tea with US physicist Richard Chace Tolman (1881-1948). Bohr was awarded the 1922 Nobel Prize for Physics for his work on the structure of the atom. He said that electrons could only occupy discrete levels around an atomic nucleus. This explained the spectrum of hydrogen. He also worked on the atomic bomb project during World War II. Tolman showed that the electron was the charge carrying particle in metals. He worked in cosmology and was an advisor on the atomic bomb project. Photographed in 1947.

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