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Stefan-Boltzmann's law

Stefan-Boltzmann's law (also known as the black-body radiant emittance) applies only to blackbodies. The radiation energy per unit time (luminoxity) from a black body is proportional to the fourth power of the absolute temperature. It can be expressed as:

Stefan–Boltzmann's law formula.
Here it is an example applying Stefan-Boltzmann's law formula. Stefan–Boltzmann's law formula example. Find the radius of Sirius.