The cosmic background radiation
A)has a blackbody spectrum.
B)has its peak emission in the microwave band.
C)corresponds to a blackbody at a temperature of 2.726 kelvins.
D)all of the above

Question

Quizplus · Accepted Answer

The cosmic background radiation has a blackbody spectrum, meaning it emits radiation at all wavelengths, and has its peak emission in the microwave band. The temperature of the radiation corresponds to a blackbody at a temperature of 2.726 kelvins, which was first predicted by the Big Bang theory and later confirmed by observations. Therefore, all of the above choices are correct.

The Cosmic Background Radiation