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[[Radio wave]]s were first identified in German physicist [[Heinrich Hertz]]'s 1887 series of experiments to prove J ...and were not used for communication but instead as laboratory instruments in scientific experiments and engineering demonstrations. ...

...d units in the background are HP 5071A cesium beam clocks. The black units in the foreground are Sigma-Tau MHM-2010 hydrogen maser standards.]] ...lectron states in an atom are associated with different energy levels, and in transitions between such states they interact with a very specific [[freque ...