Ans. Stefan-Boltzmann's Law is a fundamental principle in physics that relates the total energy radiated by a perfect black body to its temperature. It states that the total power radiated per unit surface area of a black body is proportional to the fourth power of its temperature. The law is mathematically expressed as P = εσAT^4, where P is the total power radiated, ε is the emissivity of the body, σ is the Stefan-Boltzmann constant, A is the surface area of the body, and T is its temperature.