Which scientist is generally credited with discovering ultraviolet radiation, in 1801, by observing effects just beyond the violet end of the visible spectrum?

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1. Which scientist is generally credited with discovering ultraviolet radiation, in 1801, by observing effects just beyond the violet end of the visible spectrum?

William Herschel

Johann Wilhelm Ritter

Wilhelm Röntgen

Isaac Newton

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Johann Wilhelm Ritter discovered ultraviolet radiation in 1801, using its chemical effect on silver chloride, just beyond the violet end of the visible spectrum.