Thermal Radiation: Absorption and Emission

This lecture covers the fundamental concepts of thermal radiation, including emission, Kirchoff's law, and absorption factors. It also discusses the exchange of heat through radiation, the emissivity of materials, and the influence of wavelength on emitted flux. The lecture further explores the concepts of luminance, emissivity, and the behavior of different materials (black, gray, and non-black opaque bodies) in terms of absorption, emission, and reflection.