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The terms "chemical rays" and "heat rays" were eventually dropped in favor of ultraviolet and infrared radiation, respectively. [ 15 ] [ 16 ] In 1878, the sterilizing effect of short-wavelength light by killing bacteria was discovered.
The terms chemical and heat rays were eventually dropped in favor of ultraviolet and infrared radiation, respectively. [1] 1895 Discovery of the ultraviolet radiation below 200 nm, named vacuum ultraviolet (later identified as photons) because it is strongly absorbed by air, by the German physicist Victor Schumann [2] 1895
These behaved similarly to visible violet light rays, but were beyond them in the spectrum. [3] They were later renamed ultraviolet radiation. The study of electromagnetism began in 1820 when Hans Christian Ørsted discovered that electric currents produce magnetic fields (Oersted's law).
1801 – Johann Ritter discovers ultraviolet radiation from the Sun; 1801 – Thomas Young demonstrates the wave nature of light and the principle of interference [13] 1802 – Gian Domenico Romagnosi, Italian legal scholar, discovers that electricity and magnetism are related by noting that a nearby voltaic pile deflects a magnetic needle. He ...
In 1801, the German physicist Johann Wilhelm Ritter made the discovery of ultraviolet by noting that the rays from a prism darkened silver chloride preparations more quickly than violet light. Ritter's experiments were an early precursor to what would become photography. Ritter noted that the UV rays were capable of causing chemical reactions.
The dull halogen light. The spinning glass plate. The humming that terminates in a “BEEP.” Today the sights, sounds, and smells of the microwave oven are immediately familiar to most Americans.
Wilhelm Röntgen discovered and named X-rays. After experimenting with high voltages applied to an evacuated tube on 8 November 1895, he noticed a fluorescence on a nearby plate of coated glass. In one month, he discovered X-rays' main properties. [45]: 307 The last portion of the EM spectrum to be discovered was associated with radioactivity.
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