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William Herschel was a British astronomer who discovered infrared radiation (heat waves) -
Johann Ritter was a German chemist who discovered UV ration (ultraviolet radiation). -
James Maxwell was a British scientist who predicted the possibility of continuous EM waves (electromagnetic waves). -
Heinrich Hertz is a German scientist who discovered radio waves. -
Wilhelm Roentgen was a German physicist who discovered x-rays. -
Henri Becquerel was a French physicist who discovered radioactive rays emitted by uranium. -
Marie Curie discovered the element radium. -
Paul Villard, a Frenchman, discovered gamma rays.