/
Cosmic Nucleosynthesis
Save to my account
Sign up
Cosmic Nucleosynthesis
Cosmic Nucleosynthesis
Study
1
Question
How old is the universe according to the Big Bang model?
Page 1
Answer
13.8 billion years
2
Question
What did the Big Bang create in its initial expansion?
Page 1
Answer
Space, time, and energy
3
Question
What were the first subatomic particles formed as the universe expanded and cooled?
Page 1
Answer
Protons, neutrons, and electrons
4
Question
What is Big Bang Nucleosynthesis?
Page 1
Answer
The process where protons and neutrons combined to form the first atomic nuclei
5
Question
During what timeframe after the Big Bang did Big Bang Nucleosynthesis occur?
Page 1
Answer
Within the first three to twenty minutes
6
Question
What is the most abundant element formed during Big Bang Nucleosynthesis and what percentage does it make up?
Page 1
Answer
Hydrogen (H), making up about 75% of the universe
7
Question
How was helium primarily formed during Big Bang Nucleosynthesis?
Page 1
Answer
Through the fusion of hydrogen nuclei
8
Question
What percentage of the universe does helium make up from Big Bang Nucleosynthesis?
Page 1
Answer
About 25%
9
Question
Which other elements besides hydrogen and helium were formed in tiny amounts during Big Bang Nucleosynthesis?
Page 1
Answer
Lithium (Li) and Beryllium (Be)
10
Question
Why did nuclear fusion stop about 20 minutes after the Big Bang?
Page 1
Answer
The universe cooled too much for fusion to continue
11
Question
What is the Cosmic Microwave Background Radiation?
Page 1
Answer
The faint glow of radiation that is the afterglow of the Big Bang
12
Question
How does the Cosmic Microwave Background support Big Bang Nucleosynthesis?
Page 1
Answer
Its temperature matches predictions of early universe cooling
13
Question
What observed ratio supports Big Bang Nucleosynthesis predictions?
Page 1
Answer
The hydrogen-to-helium ratio in the universe
14
Question
Why are the light elements from Big Bang Nucleosynthesis important?
Page 1
Answer
They provided the building blocks for stars, planets, and life
15
Question
How do stars form after the Big Bang?
Page 2
Answer
Gravity pulls hydrogen and helium into giant clouds called nebulae, which collapse to form protostars
16
Question
What marks the birth of a real star from a protostar?
Page 2
Answer
Nuclear fusion beginning when the core reaches about 10 million Kelvin
17
Question
What is stellar nucleosynthesis?
Page 2
Answer
Stars fusing lighter elements into heavier ones through nuclear fusion
18
Question
In small stars like the Sun, what is the first fusion step?
Page 2
Answer
Hydrogen fuses into helium (He)
19
Question
What does helium fuse into later in small stars like the Sun?
Page 2
Answer
Carbon (C) and oxygen (O)
20
Question
In massive stars, what does helium fuse into?
Page 2
Answer
Carbon (C), oxygen (O), neon (Ne), and magnesium (Mg)
21
Question
What elements do massive stars fuse after helium products?
Page 2
Answer
Silicon (Si), sulfur (S), and finally iron (Fe)
22
Question
Why does fusion stop once a star begins producing iron?
Page 2
Answer
Fusing elements beyond iron consumes energy instead of releasing it
23
Question
What event follows the end of stable fusion in a massive star?
Page 2
Answer
A supernova explosion
24
Question
How do scientists identify elements inside stars?
Page 2
Answer
Through spectroscopy of starlight
25
Question
What evidence comes from supernova observations for stellar nucleosynthesis?
Page 2
Answer
Exploding stars release newly formed elements into space, enriching the universe
26
Question
Why can't standard fusion create elements heavier than iron?
Page 3
Answer
It requires another process due to energy consumption beyond iron
27
Question
Where do elements heavier than iron primarily form?
Page 3
Answer
In supernovae, the violent explosions of massive stars
28
Question
What conditions in a supernova allow formation of elements heavier than iron?
Page 3
Answer
Extreme heat and pressure from the star collapsing under gravity
29
Question
Name three elements heavier than iron formed rapidly in supernovae.
Page 3
Answer
Nickel (Ni), cobalt (Co), lead (Pb)
30
Question
What precious metals are formed in supernovae along with uranium?
Page 3
Answer
Gold (Au) and platinum (Pt)