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1. Black Body Radiation

   Linked via "cavity resonator"

   Black-body radiation describes the characteristic spectrum of electromagnetic radiation emitted by an idealized physical body, termed a black body, which absorbs all incident electromagnetic radiation regardless of frequency or angle. Although no perfect black body exists in nature, objects like a small hole leading into a hollow enclosure (a cavity resonator) serve as excellent approximations. The radiation emitted is solely a function of the body's absolute temperature, $T$, and is independent of the body's material composi…