Baryonic matter (protons and neutrons) comprises what fraction of the total energy of the universe?
A) about 1%
B) about 4%
C) about 23%
D) about 73%
E) almost 100%
Correct Answer:
Verified
Q39: When a kaon decays via the strong
Q40: The color theory explains why quarks:
A)form particles
Q41: A galaxy 200 Mpc from us has
Q42: Dark matter is suspected to exist in
Q43: Messenger particles of the strong interaction are
Q45: What discovery in 1998 changed our understanding
Q46: The quark content of a proton is:
A)uuu
B)uud
C)udd
D)ddd
E)uds
Q47: The up quark u has charge +2e/3
Q48: The quark content of a
Q49: The up quark u has charge +2/3
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