Waves and radiations

radiation Research is closely connected with light studying. Today we know that visible light makes an insignificant part immeasurably wider electromagnetic spectrum. Nevertheless thanks to that we knew about existence of this small part of a spectrum, other forms of radiation with the unusual properties which research promoted the further progress of physics have been opened. But to find out these radiations, considerable efforts were required. All subsequent sections of physics opened hardly, and the the physics further developed, the big efforts were required.

The First opening was made in 1777 by the Swedish physicist Charles Sheele (1742-1786) investigating action of various sites of a spectrum on chloride silver. This salt at an irradiation a sunlight changes the colour with white on purple, and Sheele wished to find out, whether there was any part of a spectrum especially effective in this respect. He has established that action amplified as approaching an extreme, violet part of a spectrum.

Vollaston has proved that that part of a spectrum which lies outside of violet beams operates on chloride silver actually. In 1842 A.E.Bekke-rel (1820-1891) ' has photographed ' an ultra-violet spectrum of the Sun, having treated to action of this part of a spectrum a paper impregnated with chloride silver, and has shown existence there a great number fraungoferovyh lines.

Researches of an ultra-violet spectrum restrained properties of the prisms used for decomposition of light in a spectrum: though glass is transparent for visible light, it is opaque to ultra-violet beams. This difficulty managed to be bypassed thanks to application reflective difraktsionnoj lattices. Now ultra-violet radiation is studied in very wide range and the big application finds.

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