cost - price calculated by what has to be presented or finished or been through to acquire some thing; "the cost in human everyday living was great"; "the price of achievement is hard work"; "what cost glory?" ) and ??sh?r??—a vacation imperative that you t

For most every day situation, the Qualities of light could be derived from the speculation of classical electromagnetism, in which light is called coupled electrical and magnetic fields propagating by way of Area being a traveling wave. However, this wave theory, created within the mid-19th cent