The Stefan-Boltzmann Law, Which Relates the Energy Per Unit Area $\sigma$

Multiple Choice

The Stefan-Boltzmann law, which relates the energy per unit area F emitted by an object to its temperature T, F = $\sigma$ T⁴, is obeyed by what kind of object?

A) red-colored object, which absorbs blue light but reflects red light
B) only hot gases, whose atoms emit and absorb only specific colors (e.g., neon tubes)
C) blackbody, a perfect absorber and emitter of energy at all wavelengths
D) all objects, whatever their color or reflective properties