Describe the theory of black body.

Black body

At an exact temperature the black body would produce the maximum amount of energy probable for temperature. This would emit at each wavelength of light as this should be able to absorb each wavelength to be sure of absorbing each incoming radiation. Then maximum wavelength emitted through a black body radiator is infinite. This also produces a definite amount of energy at every wavelength for an exacting temperature, therefore standard black body radiation curves can be drawn for each temperature, demonstrating the energy radiated at each wavelength.

Black body radiation curves demonstrating peak wavelengths at various temperatures.

This graph demonstrates how the black body radiation curves change at different temperatures. Such all have their peak wavelengths into the infra-red part of the spectrum. At a specified temperature, the energy is not uniformly dispersed into the spectrum. At a provided temperature, the intensity of radiation is maximised at an exacting wavelength λm. When temperature increases, λm reduces.

For all wavelengths, raises in temperature causes an increase into the energy emission. When temperature rises, the total energy emitted increases, since the total area under the curve increases.