Question 1

A proton cannot decay into a neutron, a positron, and an electron neutrino.Which of the following conservation laws would be violated if it did?

Accepted Answer

A) Charge 
B) Linear momentum 
C) Angular momentum 
D) Energy 
E) None of the above 
A) Charge 
B) Linear momentum 
C) Angular momentum 
D) Energy 
E) None of the above

Question 2

The stability of the proton is predicted by the laws of conservation of energy and conservation of:

Accepted Answer

A) momentum 
B) angular momentum 
C) baryon number 
D) lepton number 
E) strangeness 
A) momentum 
B) angular momentum 
C) baryon number 
D) lepton number 
E) strangeness

Question 3

An example of a boson is a:

Accepted Answer

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

Question 4

Compared to the lifetimes of particles that decay via the weak interaction, the lifetimes of particles that decay via the strong interaction are:

Accepted Answer

A) 10-23 times as long 
B) 10-12 times as long 
C) 1012 times as long 
D) 1024 times as long 
E) about the same 
A) 10-23 times as long 
B) 10-12 times as long 
C) 1012 times as long 
D) 1024 times as long 
E) about the same

Question 5

Strangeness is conserved in:

Accepted Answer

A) all particle decays 
B) no particle decays 
C) all weak particle decays 
D) all strong particle decays 
E) some strong particle decays 
A) all particle decays 
B) no particle decays 
C) all weak particle decays 
D) all strong particle decays 
E) some strong particle decays

Question 6

Quarks are the constituents of:

Accepted Answer

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

Question 7

All leptons interact with each other via the:

Accepted Answer

A) strong force 
B) weak force 
C) electromagnetic force 
D) strange force 
E) none of these 
A) strong force 
B) weak force 
C) electromagnetic force 
D) strange force 
E) none of these

Question 8

The intensity of the microwave background radiation, a remnant of the big bang:

Accepted Answer

A) is greatest in directions toward the center of the galaxy 
B) is least in directions toward the center of the galaxy 
C) is proportional to the reciprocal of the distance from us 
D) is proportional to the square of the distance from us 
E) is nearly the same in all directions 
A) is greatest in directions toward the center of the galaxy 
B) is least in directions toward the center of the galaxy 
C) is proportional to the reciprocal of the distance from us 
D) is proportional to the square of the distance from us 
E) is nearly the same in all directions

Question 9

The up quark u has charge +2e/3 and strangeness 0; the down quark d has charge -e/3 and strangeness 0; the strange quark s has charge -e/3 and strangeness -1.This means there can be no baryon with:

Accepted Answer

A) charge 0 and strangeness 0 
B) charge -e and strangeness -1 
C) charge +e and strangeness -1 
D) charge +e and strangeness -2 
E) charge 0 and strangeness -2 
A) charge 0 and strangeness 0 
B) charge -e and strangeness -1 
C) charge +e and strangeness -1 
D) charge +e and strangeness -2 
E) charge 0 and strangeness -2

Question 10

What discovery in 1998 changed our understanding of the overall history of the universe?

Accepted Answer

A) The universe is permeated with radiation at microwave frequencies. 
B) The universe is expanding, and has been since the Big Bang. 
C) The expansion of the universe is slowing, and will eventually reverse, ending in a Big Crunch. 
D) The expansion of the universe is accelerating, due to an unknown cause known as dark energy. 
E) Rotational measurements of our galaxy and others demonstrated the existence of dark matter. 
A) The universe is permeated with radiation at microwave frequencies. 
B) The universe is expanding, and has been since the Big Bang. 
C) The expansion of the universe is slowing, and will eventually reverse, ending in a Big Crunch. 
D) The expansion of the universe is accelerating, due to an unknown cause known as dark energy. 
E) Rotational measurements of our galaxy and others demonstrated the existence of dark matter.

Question 11

Any meson is a combination of:

Accepted Answer

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

Question 12

The quark content of a proton is:

Accepted Answer

A) uuu 
B) uud 
C) udd 
D) ddd 
E) uds 
A) uuu 
B) uud 
C) udd 
D) ddd 
E) uds

Question 13

In order of increasing strength the four basic interactions are:

Accepted Answer

A) gravitational, weak, electromagnetic, and strong 
B) gravitational, electromagnetic, weak, and strong 
C) weak, gravitational, electromagnetic, and strong 
D) weak, electromagnetic, gravitational, and strong 
E) strong, electromagnetic, weak, and gravitational 
A) gravitational, weak, electromagnetic, and strong 
B) gravitational, electromagnetic, weak, and strong 
C) weak, gravitational, electromagnetic, and strong 
D) weak, electromagnetic, gravitational, and strong 
E) strong, electromagnetic, weak, and gravitational

Question 14

Two particles interact to produce only photons, with the original particles disappearing.The particles must have been:

Accepted Answer

A) mesons 
B) strange particles 
C) strongly interacting 
D) leptons 
E) a particle-antiparticle pair 
A) mesons 
B) strange particles 
C) strongly interacting 
D) leptons 
E) a particle-antiparticle pair

Question 15

Two baryons interact to produce pions only, the original baryons disappearing.One of the baryons must have been:

Accepted Answer

A) a proton 
B) an omega minus 
C) a sigma 
D) an antiparticle 
E) none of these 
A) a proton 
B) an omega minus 
C) a sigma 
D) an antiparticle 
E) none of these

Exam 44: Quarks, Leptons, and the Big Bang

A proton cannot decay into a neutron, a positron, and an electron neutrino.Which of the following conservation laws would be violated if it did?

The stability of the proton is predicted by the laws of conservation of energy and conservation of:

An example of a boson is a:

Compared to the lifetimes of particles that decay via the weak interaction, the lifetimes of particles that decay via the strong interaction are:

Strangeness is conserved in:

Quarks are the constituents of:

All leptons interact with each other via the:

The intensity of the microwave background radiation, a remnant of the big bang:

The up quark u has charge +2e/3 and strangeness 0; the down quark d has charge -e/3 and strangeness 0; the strange quark s has charge -e/3 and strangeness -1.This means there can be no baryon with:

What discovery in 1998 changed our understanding of the overall history of the universe?

Any meson is a combination of:

The quark content of a proton is:

In order of increasing strength the four basic interactions are:

Two particles interact to produce only photons, with the original particles disappearing.The particles must have been:

Two baryons interact to produce pions only, the original baryons disappearing.One of the baryons must have been:

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