A blue supergiant star has a radius of 7.4 × 10¹⁰ m.The spherical surface behaves as a blackbody radiator.If the surface temperature is 2.4 × 10⁴ K,what is the rate at which energy is radiated from the star?

Question

Quizplus · Accepted Answer

The rate of energy radiated by a blackbody is given by the Stefan-Boltzmann law: P = σA(T^4), where σ is the Stefan-Boltzmann constant (5.67 × 10⁻⁸ W/m²K⁴), A is the surface area (4πr²), and T is the temperature. Calculating with the given values, the result is approximately 1.3 × 10³³ J/s.

A Blue Supergiant Star Has a Radius of 7