Physics 274 (Sp03) Final Exam Study Guide (Chapts 39, 40, & 41)
The final exam will consist of 40 multiple choice questions plus five other questions
model on (or taken from) the homework.
The 40 multiple choice questions will contain about 20 questions from Chapts 39, 40 &
41 that are similar to the questions in this study guide.
Electron mass = me = 9.1 x 10-31 kg; mec2 = 0.511 MeV
Proton mass = mp = 1.673 x 10-27 kg; mpc2 = 938.3 MeV
Neutron mass = mn = 1.675 x 10-27 kg; mnc2 = 939.6 MeV
Planck's constant = h = 6.63 x 10-34 Js; hc = 1240 eV nm
speed of light c = 3 x 10 8 m/s
1. An antiproton is an atomic particle that has (read sect. 41-2)
a) the mass of a proton and the charge of an electron. !
b) the mass of an electron and the charge of a proton.
c) the mass of a neutron and the charge of a proton.
d) the mass of a proton and the charge of a neutron.
e) the mass of an electron and the charge of a positron.
2. A certain radioactive element has a half-life of 20 d. The time it will take for 7/8 of the
atoms originally present to disintegrate is (read sect 40-2; study example 40-2)
a) 20 d
b) 40 d
c) 60 d !
d) 80 d
e) 100 d
3. Which of these nuclear reactions is possible? (Conserve charge & baryon number)
a)
b) !
c)
d)
e) None of these is possible.
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, Physics 274 (Sp03) Final Exam Study Guide (Chapts 39, 40, & 41)
4. A conservation law that is not universal but applies only to certain kinds of interactions is
conservation of (Read sect 41-3; study example 41-3)
a) lepton number
b) baryon number
c) spin
d) charge
e) strangeness !
5. In quantum electrodynamics (QED), electromagnetic forces are mediated by
(Read sect 41-5; study Table 41-4)
a) the interaction of electrons.
b) hadrons.
c) action at a distance.
d) the weak nuclear interaction.
e) the exchange of virtual photons. !
6. What are the numbers of protons Z and neutrons N in the missing fragment of the
following fission reaction? (Conserve charge and baryon number)
a) Z = 55 and N = 37
b) Z = 37 and N = 55 !
c) Z = 92 and N = 37
d) Z = 37 and N = 92
e) Z = 37 and N = 58
7. Conservation laws that describe events involving the elementary particles include the
conservation of (Read sect 41-3; study examples 41-2 & 41-3)
a) energy.
b) linear and angular momentum.
c) electric charge.
d) baryon and lepton numbers.
e) All of these are correct. !
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The final exam will consist of 40 multiple choice questions plus five other questions
model on (or taken from) the homework.
The 40 multiple choice questions will contain about 20 questions from Chapts 39, 40 &
41 that are similar to the questions in this study guide.
Electron mass = me = 9.1 x 10-31 kg; mec2 = 0.511 MeV
Proton mass = mp = 1.673 x 10-27 kg; mpc2 = 938.3 MeV
Neutron mass = mn = 1.675 x 10-27 kg; mnc2 = 939.6 MeV
Planck's constant = h = 6.63 x 10-34 Js; hc = 1240 eV nm
speed of light c = 3 x 10 8 m/s
1. An antiproton is an atomic particle that has (read sect. 41-2)
a) the mass of a proton and the charge of an electron. !
b) the mass of an electron and the charge of a proton.
c) the mass of a neutron and the charge of a proton.
d) the mass of a proton and the charge of a neutron.
e) the mass of an electron and the charge of a positron.
2. A certain radioactive element has a half-life of 20 d. The time it will take for 7/8 of the
atoms originally present to disintegrate is (read sect 40-2; study example 40-2)
a) 20 d
b) 40 d
c) 60 d !
d) 80 d
e) 100 d
3. Which of these nuclear reactions is possible? (Conserve charge & baryon number)
a)
b) !
c)
d)
e) None of these is possible.
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, Physics 274 (Sp03) Final Exam Study Guide (Chapts 39, 40, & 41)
4. A conservation law that is not universal but applies only to certain kinds of interactions is
conservation of (Read sect 41-3; study example 41-3)
a) lepton number
b) baryon number
c) spin
d) charge
e) strangeness !
5. In quantum electrodynamics (QED), electromagnetic forces are mediated by
(Read sect 41-5; study Table 41-4)
a) the interaction of electrons.
b) hadrons.
c) action at a distance.
d) the weak nuclear interaction.
e) the exchange of virtual photons. !
6. What are the numbers of protons Z and neutrons N in the missing fragment of the
following fission reaction? (Conserve charge and baryon number)
a) Z = 55 and N = 37
b) Z = 37 and N = 55 !
c) Z = 92 and N = 37
d) Z = 37 and N = 92
e) Z = 37 and N = 58
7. Conservation laws that describe events involving the elementary particles include the
conservation of (Read sect 41-3; study examples 41-2 & 41-3)
a) energy.
b) linear and angular momentum.
c) electric charge.
d) baryon and lepton numbers.
e) All of these are correct. !
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