An Astronomer Plots the Intensity of the Radiation Emitted from an Opaque

Multiple Choice

An astronomer plots the intensity of the radiation emitted from an opaque object at a certain temperature versus its wavelength. As the object's temperature increases, the total amount of energy emitted all across the spectrum increases as the fourth power of the temperature. This is an illustration of

A) the Stefan-Boltzmann law.
B) Kepler's first law.
C) Bode's law.
D) Wien's displacement law.