Can light or energy can only be produced out of nuclear reactions only? How then light or energy is obtained from a normal lamp or the first bulb made by Thomas Alva Edison? regards?
Light is ordinarily produced by interactions at the level of the atom rather than at the level of the nucleus of the atom. Light from an incandescent bulb is produced when a metal (e.g. Tungsten) is heated up by an electric current. The electrons in the metal get excited to higher energy levels in the metal. When they fall back to lower levels, light is emitted. The metal therefore glows white-hot.
Edison and his associates conducted over 3,000 experiments trying to find the best materials. It took months of research to find a filament material that would produce the best light. Eventually, in October 1879, Edison successfully produced a practical light bulb using a carbon filament made from burned sewing thread. Eventually, other materials, such as bamboo, were used for filaments because they increased the length of time a light bulb would burn. Edison’s first light bulb was made with a glass bulb that had no oxygen in it and burned for about 40 hours. http://www.google.com/url?sa=t&rct=...FM6kvZP-FmmZ--rQA&sig2=AIhxDlIh_4xL-2-BN3pVyg
