Infrared, Ultraviolet and Ionising Radiation

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Discovery of Infrared

Herschel used a prism to split up light into the known colours. He used a themometer to test the temperatures of the colours. He discovered that just before red was the hottest colour and so he deduced that there must be another non-visable wave present.

Discovery of Ultraviolet

Ritter used silver chloride which turns black when it is exposed…


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