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Electromagnetic Spectrum Timeline

By Tristan.Toivonen
  • Infra-Red

    Infra-Red

    William Herschel, a British astronomer, discovered infra-red radiation
  • UV radiation

    UV radiation

    German chemist Johann Ritter discovered UV radiation
  • EM waves

    EM waves

    James Maxwell, a British scientist, predicted the existence of continuous EM waves
  • Radio waves

    Radio waves

    German scientist Heinrich Hertz disovered radio waves
  • X-rays

    X-rays

    German physicist Wilhelm Roentgen discovered x-rays
  • Radioactive rays

    Radioactive rays

    French physicist Henri Becquerel discovered radioactive rays emitted by uranium
  • Radium

    Radium

    Marie Curie discovered radium
  • Gamma rays

    Gamma rays

    Frenchman Paul Villard discovered gamma rays