Black Body Radiation: Black body radiation refers to the electromagnetic radiation emitted by a theoretical object known as a black body. A black body is an idealized object that absorbs all radiation incident upon it and emits radiation at all wavelengths. The radiation emitted by a black body is determined solely by its temperature and is independent of its composition or other properties. Black body radiation follows Planck's law, which describes the spectral distribution of radiation emitted by a black body as a function of temperature.
Grey Body Radiation: A grey body is an object that partially absorbs and partially reflects or transmits radiation incident upon it. Unlike a black body, a grey body does not absorb all incident radiation but rather absorbs a fraction of it. As a result, a grey body emits less radiation compared to a black body at the same temperature. The spectral distribution of radiation emitted by a grey body is generally not uniform but depends on its absorption and emission properties. However, for simplicity, it is often assumed that the emission spectrum of a grey body is proportional to that of a black body at the same temperature.
White Body Radiation: The term "white body radiation" is not a commonly used scientific term and is not typically employed in physics or related fields. It is possible that you may be referring to "white noise" or "white light" instead.
White noise refers to a random signal that contains equal intensity at all frequencies. It is often used in signal processing and communication systems. In physics, white light is a term used to describe visible light that appears colorless because it contains equal intensities of all visible wavelengths, resulting in a balanced spectrum. When white light passes through a prism or is dispersed, it breaks down into a spectrum of colors known as a rainbow.
In summary, black body radiation refers to the radiation emitted by an idealized object that absorbs all radiation incident upon it. Grey body radiation is emitted by an object that partially absorbs radiation, while white body radiation is not a scientifically recognized term and may be referring to other concepts like white noise or white light.