Which of the following were present in large amounts at about three minutes afte
ID: 232443 • Letter: W
Question
Which of the following were present in large amounts at about three minutes after the big bang? Select all correct answers.
1. Free electrons
2. Free protons
3. Free quarks
4. Photons
5. Completely ionized nuclei heavier than helium
6. Free muons
7. Completely ionized helium
8. Neutral atoms
Incorrect answers I've tried: Photons, free electrons, free photons. Photons, free muons, free electrons, free photons. Photons, free electrons, free photons, free quarks. Photons, free electrons, free photons, neutral atoms. All were partially correct.
When did large amounts of completely ionized helium nuclei begin to accumulate in the universe?
1. A microsecond after the big bang
2. A second after the big bang
3. Ten seconds after the big bang
4. One hour after the big bang
5. A thousand years after the big bang
6. A few hundred thousand years after the big bang
7. Three minutes after the big bang
8. A half a billion years after the big bang
9. More than a billion years after the big bang
Incorrect answers I've tried: A thousand years after the big bang. A few hundred thousand years after the big bang. A half a billion years after the big bang.
UPDATE: Figured it out. Answers were photons, free electrons, free photons, completely ionized nuclei, and three minutes after the big bang.
Explanation / Answer
Answer: free electrons, free photons, photons and completely ionized helium: The universe was born about 13.7 billion years ago with a huge explosion called Big Bang. At that time universe was very hot and expanding. When the universe was just 10-34 second or old it experienced inflation in which the space expanded more than the speed of light. As it grows it cools. At first the universe dominated mainly by radiation. Then quarks formed which combines together to form baryons i.e protons and neutrons. When the universe was 3 minutes old the neutrons and protons combine to form nuclei. This process is known as nucleosynthesis. Hydrogen, beryllium and helium and lithium were produced. The universe was still too hot to allow these nucleui to attract electrons and form photons. So three minutes after the big bang, free electrons, photons, completely ionized helium, free photons were mainly present in the universe.
Answer: Three minutes after the Big bang: The first three minutes after the big bang was very important since during this short time period all the hydrogen and most of the helium were formed in the universe. These are the most abundant elements in the universe from which first stars and galaxies were formed.
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