Introduction to Waves

Question 1

Which statements describe some of the original ideas proposed about the universe during the big bang? Check all that apply.

Revolt · Accepted Answer

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

Question 2

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

Part 1: carbon; Part 2: supernova

Question 3

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 4

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 5

Order the events to show the evolution of the universe after the big bang. Inflation: Nucleosynthesis: Formation of first stars: Formation of subatomic particles: Separation of last two fundamental forces:

Revolt · Accepted Answer

1; Selection 1: 1; Selection 2: 4; Selection 3: 5; Selection 4: 3; Selection 5: 2

Question 6

Question 13

Revolt · Accepted Answer

4

Question 7

Question 14

Revolt · Accepted Answer

5

Question 8

Question 15

Revolt · Accepted Answer

3

Question 9

Question 16

Revolt · Accepted Answer

2

Question 10

Arcturus is a star whose surface temperature is 4290 K. What is most likely the color of Arcturus? What is most likely the mass of Arcturus? about solar masses

Revolt · Accepted Answer

Part 1: orange; Part 2: 0.8

Introduction to Waves Answers

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