Baryons are composed of _______ quarks, and mesons are composed of ________ quarks.
a. two, two
c. three, three
b. two, three
d. three, two
[Ques. 2] The charge of some quarks or anti-quarks is:
a. 0.
c. 1 (1.6 10-19) C.
b. 1/2 (1.6 10-19) C.
d. 1/3 (1.6 10-19) C.
[Ques. 3] Which of the following particles is made of two smaller particles?
a. electron
c. photon
b. proton
d. None of these choices.
[Ques. 4] If a K0 meson at rest decays in 0.90 10-10 s, how far will a K0 meson moving at 0.95c travel through a bubble chamber? (c = 3.00 108 m/s)
a. 2.6 cm
c. 9.3 cm
b. 8.2 cm
d. 13 cm
[Ques. 5] Which of the following is not conserved?
a. lepton number
c. baryon number
b. meson number
d. energy
[Ques. 6] If a photon produces an electron-positron pair and one other particle, the other particle may be a(n):
a. photon.
c. muon.
b. antineutrino.
d. neutrino.
[Ques. 7] A neutron and a proton have the same:
a. charge.
c. baryon number.
b. half-life.
d. mass.
[Ques. 8] Which of the following is not a meson?
a. the phi
c. the pion
b. the kaon
d. All of the above are mesons.
[Ques. 9] Which of these particles has the least mass?
a. electron neutrino
c. electron
b. muon
d. pion
[Ques. 10] The size and sign of the charge on an electron is the same as that for:
a. an antiproton.
c. an antineutron.
b. a positron.
d. an antineutrino.
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