8
QuizMultiple Choice
Unit Test — Unit test
Question 8 • 3262 CR Physics B 25/26
Kathy drew a timeline to show some of the major events that occurred during the evolution of the universe.Which best describes Kathy’s error?
Answer
A
Quarks and electrons formed at 10–35 s, not 10–10 s.B
Protons formed first, then neutrons formed at 100 s.C
Nebulae formed around 109 y after hydrogen and helium formed.D
Hydrogen and helium were created at 3000 s, before nebulae formed.