The Luminescence Of Black Light :: essays research papers

The Luminescence of Black Light     Black Light. What is it? It is a depute of the Ultra-Violet Spectrumthat is invisible to our eyes. We can not distinguish it. However, when thisradiation impinges on certain(prenominal) materials visible write down is emitted and this isknown as "fluorescence." Fluorescence is visible to the human eye, in that itmakes an object appear to "glow in the dark."     There are some(prenominal) sources of ultra- chromatic giddy. These sources are thesun, carbon arcs, mercury arcs, and black lights. In most cases, the actionof ultra-violet light creates a reasonable amount of heat.     Many materials butt the crotchety characteristic of giving off lightor radiant life force when ultra-violet light is allowed to fall upon them. This iscalled luminescence. In most cases, the wave length of the light radiated islonger than that of the ultra-violet vexation but a few excepti ons fork over beenfound.     The quantum opening attempts to explain this property by contending thata certain outside excitation causes an electron to jump from one orbit toanother. It is then in an uncertain environment causing it to fall back into itsoriginal orbit. This process releases energy, and if it is in the visible partof the spectrum, we have a transient light phenomenon. Ultra-violet light is anexciting agent which causes luminescence to occur.     There are many materials which exhibit fluorescent characteristics.Many of which are even organic. Teeth, eyes, some portions of the skin, andeven filiation exhibit fluorescent qualities. Naturally occurring minerals such asagate, calcite, chalcedony, curtisite, fluorite, gypsum, hackmanite, halite,opal scheelite, and willemite, also have similar characteristics. Thesematerials can be used in industries.     The radiance of ultraviolet light light is measured in units called"Angstrom." The intensity of ultraviolet fluorescence is the greatest amongthe 5000 and 6000 range. This being the range between the green and yellow hues.     Ultra violet light is not readily visible. It is not visible becausecertain materials glint it. Ultra-violet light is made visible due to thefact that it causes a reaction at the atomic level. When it strikes the atom,some of the electrons are sent into other orbits.