Dark matter is suspected to exist in the universe because:
A) the night sky is dark between stars
B) the orbital period of stars in the outer parts of a galaxy is greater than the orbital period of stars near the galactic center
C) the orbital period of stars in the outer parts of a galaxy is less than the orbital period of stars near the galactic center
D) the orbital period of stars in the outer parts of a galaxy is about the same as the orbital period of stars near the galactic center
E) all galaxies have about the same mass
Correct Answer:
Verified
Q37: Color is carried by:
A)only quarks
B)only leptons
C)only quarks
Q38: A baryon with strangeness -1 decays via
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
Q43: Messenger particles of the strong interaction are
Q44: Baryonic matter (protons and neutrons)comprises what fraction
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
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