This is close to a photographic topic right? > -----Original Message----- > From: Chris [mailto:nimbo@ukonline.co.uk] > > The promoted electron will usually fall back and re-emit > another photon at > the same frequency but it will be in all directions so the > intensity in the > bean direction is reduced. > Chris you said the promoted electron will USUALLY fall back. Does this mean they do not always fall back? If so, is that why things fade in sunlight? Why we must never project transparencies for fear of color shift? Greg
