Of A Photon

Lasers
Lasers
Lasers The light from lasers differs from ordinary light in several important aspects. Ordinary light from a light bulb travels randomly in all directions (unless the bulb is equipped with an integral reflector that directs the light). The light is thus incoherent. Even when incoherent light is directed with a reflector, it still spreads rapidly. The light from a laser is temporary and spatially coherent. This means that all of the wave-fronts of light are lined up in time and space (see Diagram
Acid Rain
Acid Rain
Acid Rain What is acid rain? Acid rain is the term for pollution caused when sulfur and nitrogen dioxides combine with atmospheric moisture. The term \'acid rain\' is slightly misleading, and would be more accurate if deemed \'enhanced acid rain\', as rain occurs acidic naturally. Acidity is measured on what is know as the pH scale. Fourteen is the most basic, seven is the most neutral, and zero is the most acidic. Pure rain has a pH level of 7, which is exactly neutral. The acidity of rain is d
Excimer laser and its applications
Excimer laser and its applications
Excimer laser and its applications Introduction The first report of a new type of excimer system came from Golde and Thrush at Cambridge who observed characteristic bound-free transitions in ArCl produced by reacting argon metstables with chlorine in a flowing afterglow system. At present the rare-gas halidel asers are undoubtedly the most important excimer lasers and are being actively developed for applications in laser-induced fusion and isotope separation. A large amount of energy, ranging f
Chemistry Open Book Paper
Chemistry Open Book Paper
Chemistry Open Book Paper Atomic spectroscopy is a chemical analysis technique and it is used to identify what elements are in a compound. It uses the idea of a photon being absorbed or emitted whenever an electron changes from one energy level to another. The diagram below shows sodium salt being sprinkled onto a flame and yellow light being emitted. Emission spectra are produced by thin gases in which the atoms do not experience many collisions (because of the low density). The emission of yel