To talk about how ultraviolet light is discovered, we must first talk about infrared light. Infrared is one of the many invisible rays of the sun. It was discovered by British scientist Herschel (1738.11-1822.8) in 1800. It is also called infrared heat radiation and has a strong heat effect.
Now that there is "infrared" besides red, is there "ultraviolet" besides purple? Such a problem is not just that we ordinary people think so, a scientist is just like us, and there is a basis for people to believe that "physical things have bipolar symmetry." There is invisible radiation outside, so invisible radiation must be found outside the purple end of the visible spectrum. So I started to experiment.
In 1801, the scientist first soaked a piece of paper in a silver chloride solution, and then placed it near the violet region of the visible spectrum of the J prism. He found that the paper on the outside of the purple light turned black strongly, indicating that this part of the paper was irradiated by an invisible radiation. He called the invisible light near the violet light "deoxygenation rays", which is what we call ultraviolet rays. He also called the invisible light near the red light "oxidation tick" line, that is, infrared light. Since then, mankind has continued to develop the use of ultraviolet rays for the benefit of mankind.
He was the German scientist Ritter. Ritter was born in Samnitz in December 1776. He studied medicine at the University of Jena from 1791 to 1795, but in 1797 Ritter began to engage in electrical and electrochemical research. He is a pioneer in the study of galvanic electricity in Germany. In September 1800, he submitted a report. In the water electrolysis experiment, he successfully collected two kinds of gases (you should all know what they are), and electrolyzed copper from bile alum.
