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Willian Herschel is a british astronomer, discovered infra-red radiation (heat waves).
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Johann Ritter is aGerman chemist discovered UV radiation.
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James Maxwell British scientist, predicted the existence of continuous EM waves.
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Heinrich Hertz german scientist discovered radio waves.
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Wihelm Roentgen is a german physicist discovered x-rays.
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Henri Becquerel is a French physicist discovered radioactive rays emitted by uranium.
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