Which of these did NOT occur at decoupling?
A)The cosmic microwave radiation was released from matter.
B)Neutral atoms were formed.
C)Matter dominated radiation.
D)Electrons began to orbit protons.
E)The universe became transparent.

Question

Quizplus · Accepted Answer

Decoupling refers to the time when the universe became transparent as the cosmic microwave radiation was released from matter and neutral atoms were able to form. Electrons had already been orbiting protons to form neutral hydrogen atoms. The dominance of matter over radiation occurred much earlier, during the era of nucleosynthesis. At decoupling, radiation dominated matter as it had a higher energy density. This eventually led to the release of cosmic microwave radiation and the formation of neutral atoms, which allowed the universe to become transparent. However, electrons were already orbiting protons before decoupling occurred.

Which of These Did NOT Occur at Decoupling