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Which of the following were present in large amounts at abou

Which of the following were present in large amounts at about three minutes after the big bang? Select all correct answers. 1. Neutral atoms 2. Free muons 3. Free protons 4. Photons 5. Free quarks 6. Completely ionized nuclei heavier than helium 7. Completely ionized helium 8. Free electrons

Solution

3. free protons

4. photons

8. free electrons

Which of the following were present in large amounts at about three minutes after the big bang? Select all correct answers. 1. Neutral atoms 2. Free muons 3. F

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