With this strong background, Bohr went on to a distinguished career at the University of Copenhagen, where he was awarded the Gold Medal of the Royal Danish Academy of Sciences and Letters for his work on the measurement of surface tension using the vibrations of water jets. He received a doctorate in 1911 for his study of the electron theory of metals. His work highlighted the limitations of classical physics in dealing with the atomic level and anticipated his future explorations. Bohr's found a clear direction when he met Ernest Rutherford, a professor of physics at the University of Manchester, where Bohr soon joined Rutherford's group. Here, starting around 1912, he began work on some of his most important contributions to quantum physics. He was among the first, for example, to recognize the significance of encircling electrons and their relationship to the atomic nucleus. Moreover, he began to refine
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