SEGRE COLLECTION / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY SEGRE COLLECTION / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY
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Marconi and Bohr at a conference in Rome, Italy, 1931. Guglielmo Marconi (1874-1937, left), Italian inventor, developed the radio in about 1900. Niels Henrik David Bohr (1885-1962, right), Danish theoretical physicist, developed a model of the hydrogen atom (1913) with quantized (discrete) energy levels for electrons orbiting the nucleus. This explained the hydrogen line spectrum. Bohr won the 1922 Nobel Prize for Physics, Marconi the 1909 Prize. Francis Aston (1877-1945, 1922 Chemistry Nobel) is at far right.
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