12 July

  • 1863 Birth of Paul Drude, known for his eponymous model of electrical conduction
  • 1913 Birth of Willis Lamb, winner of the 1955 Nobel Prize along with Polycarp Kusch for “discoveries concerning the fine structure of the hydrogen spectrum". He lends his name to the Lamb shift – the difference in energy between two of the energy levels in a hydrogen atom, which were predicted by Paul Dirac to have the same energy and which are caused by the interaction of the atom’s electron with the vacuum
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