Question

9. [4pt]
Determine whether the following events occurred either B - Before the universe was five minutes old, or A - After the universe was five minutes old..

A) The temperature of the universe fell to $10^{15}$ K.
B) Galaxies formed.
C) Carbon nuclei are formed by fusion reactions.
D) The strong force and electroweak forces first became distinct.
E) Inflation occurred.
F) Antielectrons (positrons) are as common as electrons.
G) Photons of the cosmic microwave background are released.
H) Stars formed.

Answer 1

A) The temperature of the universe fell to 10^15 K. ( B _ Before five minutes)
B) Galaxies formed. ( A_ After five minutes)
C) Carbon nuclei are formed by fusion reactions. (A_ After five minutes)
D) The strong force and electroweak forces first became distinct. (B_Before five minutes)
E) Inflation occurred. (B_Before five minutes)
F) Antielectrons (positrons) are as common as electrons.(B- Before five minutes)
G) Photons of the cosmic microwave background are released.( A- After five minutes)
H) Stars formed. ( A- After five minutes)

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