As the nineteenth century came to a close, three discoveries revolutionized physics, set the stage for remarkable technological developments, and ushered in a new century and a new physics. In 1895 Roentgen discovered x-rays; in 1896 Becquerel discovered radioactivity; in 1897 J.J. Thomson discovered the electron. Each discovery became a new tool with which physicists explored the atom and made the discoveries that have led to the extraordinary technology that underpins our society today.
KeywordsRock Salt Compton Scattering Atomic Plane Calcite Crystal American Physical Society
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