Multiple Choice
Before the decoupling:
A) the Universe was transparent to radiation.
B) the Universe was opaque to radiation.
C) protons and electrons combined to form atoms.
D) there was more helium than hydrogen.
E) deuterium produced electrons and positrons.
Correct Answer:
Verified
Correct Answer:
Verified
Related Questions
Q43: At decoupling, the electrons and protons were
Q44: At this time, the universe is:<br>A)radiation dominated.<br>B)quark
Q45: The crossover point from radiation to
Q46: How does the energy of the cosmic
Q47: Because of their mass, the threshold temperature
Q49: Why were elements heavier than helium not
Q50: Deuterium and helium could be made only
Q51: Describe the conditions of matter and radiation
Q52: Sound waves in the early universe are
Q53: After the atomic epoch, and before the