NAME : ANISHA FRIDAY
ID NUMBER: 00037471
NAME OF ACTIVITY: BLACKBODY AND THE RADIATION LAWS
The term black body was introduced by Gustav Kirchhoff in 1860. When used as a compound adjective, the term is typically written as hyphenated, for example, black-body radiation, but sometimes also as one word, as in blackbody radiation. Black-body radiation is also called complete radiation or temperature radiation or thermal radiation.
A black body is a theoretical object that absorbs 100% ...view middle of the document...
This value is known as the black body radiation. It would emit at every wavelength of light as it must be able to absorb every wavelength to be sure of absorbing all incoming radiation. The maximum wavelength emitted by a black body radiator is infinite.
All objects absorb electromagnetic radiation at different temperature, these objects in turn send back out this heat absorbed which is called thermal radiation. The hotter the object the more thermal radiation it gives off some surfaces are better than others at reflecting and absorbing thermal radiation eg light and dark surfaces. So as explained in the slide radiation is absorbed by all oragnisms but some retain or hold heat better than others, hence the term "blackbody" radiation.
***Stefan-Boltzmann law - Objects that have a very high temperature emit energy at a greater rate or intensity than objects at a lower temperature. Thus, as the temperature of an object increases, more total radiation is emitted each second
***Wien's Law- Every object that has a temperature gives off light at all wavelengths of the electromagnetic spectrum. But no object gives off all wavelengths equally: the Sun gives off more yellow light than radio waves, and a human body gives off more infrared radiation than x-rays. The wavelength at which an object gives off most of its light (often referred to as its "wavelength of maximum emission.