Lesson 6.3 Origin and Evolution of the Universe

Question 1

Which statements describe some of the original ideas proposed about the universe during the big bang? Check all that apply.The universe exploded.The universe was opaque.The universe was one second old.The universe was very hot and dense.The universe expanded from a single point.

Revolt · Accepted Answer

The universe was opaque.; The universe was very hot and dense.; The universe expanded from a single point.

Question 2

Question 2

Revolt · Accepted Answer

helium

Question 3

When a high-mass main sequence star runs out of both hydrogen and helium in its core, the core begins to fuse . When nuclear fusion ends in a high-mass star, the heavy elements formed in the star’s core are released through a .

Revolt · Accepted Answer

carbon; supernova

Question 4

Question 4

Revolt · Accepted Answer

supernova

Question 5

Which were predictions based on the big bang theory? Select all that apply.leftover radiation exists from the big banglow-mass stars become white dwarfshigh-mass stars become neutron starshydrogen and helium exist in abundancethe universe is still expanding

Revolt · Accepted Answer

leftover radiation exists from the big bang; hydrogen and helium exist in abundance; the universe is still expanding

Question 6

Explain how hydrogen and helium nuclei were first formed in the universe.

Revolt · Accepted Answer

Hydrogen and helium nuclei were formed in the universe through a process called nucleosynthesis. Deuterium (a hydrogen isotope) nuclei were formed when protons and neutrons combined. Neutrons combined with deuterium nuclei to form tritium. A proton would then fuse with tritium to form helium nuclei.

Question 7

What did you include in your response? Check all that apply.

Revolt · Accepted Answer

A process called nucleosynthesis formed the first hydrogen and helium atoms in the universe.; When the protons and neutrons combined, hydrogen nuclei were formed.; Hydrogen nuclei fused with neutrons, forming nuclei of deuterium.; Protons combined with deuterium, forming helium nuclei.

Question 8

Order the events to show the evolution of the universe after the big bang.

Revolt · Accepted Answer

✔ 1; Inflation:: 1; Nucleosynthesis:: 4; Formation of first stars:: 5; Formation of subatomic particles:: 3; Separation of last two fundamental forces:: 2

Question 9

123✔ 45

Revolt · Accepted Answer

✔ 4

Question 10

1234✔ 5

Revolt · Accepted Answer

✔ 5

Lesson 6.3 Origin and Evolution of the Universe Answers

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