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The velocities of distant objects in the universe indicate that the time elapsed since the big bang is about:


A) 105 y
B) 1010 y
C) 1015 y
D) 1020 y
E) 1025 y

F) D) and E)
G) All of the above

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Any baryon is a combination of:


A) three quarks
B) two quarks and an antiquark
C) one quark and two antiquarks
D) one quark and one antiquark
E) two quarks

F) A) and B)
G) C) and D)

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An example of a boson is a:


A) photon
B) electron
C) neutrino
D) proton
E) neutron

F) B) and E)
G) A) and B)

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Quarks are the constituents of:


A) all particles
B) all leptons
C) all strongly interacting particles
D) only strange particles
E) only mesons

F) A) and B)
G) B) and E)

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Messenger particles of the strong interaction are called:


A) gluons
B) photons
C) W and Z
D) gravitons
E) pions

F) A) and B)
G) C) and D)

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