The Luminescence Of Black Light :: essays research papers

The Luminescence of Black Light     Black Light. What is it? It is a portion of the immoderate-Violet Spectrumthat is invisible to our eyes. We can not distinguish it. However, when thisradiation impinges on authoritative materials visible timid is emitted and this isknown as "fluorescence." Fluorescence is visible to the merciful eye, in that itmakes an object appear to "glow in the dark."     There atomic number 18 several sources of ultra-violet light. These sources are thesun, carbon arcs, mercury arcs, and black lights. In most cases, the productionof ultra-violet light creates a reasonable amount of heat.     Many materials let on the peculiar characteristic of giving off lightor glad energy 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 excitation but a few exceptions sport beenfound.     The quantum theory attempts to explain this property by contending thata certain remote excitation causes an electron to jump from one orbit toan otherwise. It is then in an unstable environment causing it to fall back into itsoriginal orbit. This wait on 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 some(prenominal) materials which exhibit fluorescent characteristics.Many of which are eve organic. Teeth, eyes, some portions of the skin, andeven blood exhibit fluorescent qualities. Naturally occurring minerals such asagate, calcite, chalcedony, curtisite, fluorite, gypsum, hackmanite, halite,opal scheelite, and willemite, similarly have similar characteristics. Thesematerials can be used in industries.     The effulgence of ultraviolet light is measure d in units called"Angstrom." The intensity of ultraviolet fluorescence is the superlative betweenthe 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 reflect 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.