Question 1

In terms of quark content a beta decay can be written:

Accepted Answer

A)  udd $\rightarrow$ uud + e- +$\nu$ 
B)  udd $\rightarrow$ udd + dd + $\nu$ 
C)  udd $\rightarrow$ udd + dd + e- 
D)  udd $\rightarrow$ uud + ud + $\nu$ 
E)  udd $\rightarrow$ uud + ud + e- + $\nu$ 
A)  udd $\rightarrow$ uud + e- +$\nu$ 
B)  udd $\rightarrow$ udd + dd + $\nu$ 
C)  udd $\rightarrow$ udd + dd + e- 
D)  udd $\rightarrow$ uud + ud + $\nu$ 
E)  udd $\rightarrow$ uud + ud + e- + $\nu$ A

Question 2

The quark content of a  $\pi$+ meson is:

Accepted Answer

A)  uu 
B)    
C)  ud 
D)    
E)    
A)  uu 
B)    
C)  ud 
D)    
E)    D

Question 3

If dark matter did not exist it is likely that:

Accepted Answer

A)  the universe would expand forever 
B)  the universe would begin contracting soon 
C)  the night sky would be brighter 
D)  the night sky would be darker 
E)  we would be able to see the center of the universe 
A)  the universe would expand forever 
B)  the universe would begin contracting soon 
C)  the night sky would be brighter 
D)  the night sky would be darker 
E)  we would be able to see the center of the universe A

Question 4

A baryon with strangeness -1 decays via the strong interaction into two particles, one of which is a baryon with strangeness 0. The other might be:

Accepted Answer

A)  a baryon with strangeness 0 
B)  a baryon with strangeness +1 
C)  a meson with strangeness -1 
D)  a meson with strangeness +1 
E)  a meson with strangeness 0 
A)  a baryon with strangeness 0 
B)  a baryon with strangeness +1 
C)  a meson with strangeness -1 
D)  a meson with strangeness +1 
E)  a meson with strangeness 0

Question 5

The baryon number of a quark is:

Accepted Answer

A)  0 
B)  1/2 
C)  1/3 
D)  2/3 
E)  1 
A)  0 
B)  1/2 
C)  1/3 
D)  2/3 
E)  1

Question 6

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 7

Any baryon 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 8

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 9

All particles with spin angular momentum   :

Accepted Answer

A)  interact via the strong force 
B)  travel at the speed of light 
C)  obey the Pauli exclusion principle 
D)  have non-zero rest mass 
E)  are charged 
A)  interact via the strong force 
B)  travel at the speed of light 
C)  obey the Pauli exclusion principle 
D)  have non-zero rest mass 
E)  are charged

Question 10

Hubble's law is evidence that:

Accepted Answer

A)  the speed of light is increasing 
B)  the universe is expanding 
C)  the Earth is slowing down in its orbit 
D)  galaxies have rotational motion 
E)  none of the above 
A)  the speed of light is increasing 
B)  the universe is expanding 
C)  the Earth is slowing down in its orbit 
D)  galaxies have rotational motion 
E)  none of the above

Question 11

A certain process produces mesons that decay with a lifetime of 6 *10-10 s. The decay is a result of:

Accepted Answer

A)  the gravitational interaction 
B)  the weak interaction 
C)  the electromagnetic interaction 
D)  the strong interaction 
E)  some combination of the above 
A)  the gravitational interaction 
B)  the weak interaction 
C)  the electromagnetic interaction 
D)  the strong interaction 
E)  some combination of the above

Question 12

Objects in the universe are receding from us with a speed that is proportional to:

Accepted Answer

A)  the reciprocal of their distance from us 
B)  the reciprocal of the square of their distance from us 
C)  their distance form us 
D)  the square of their distance from us 
E)  their distance from the center of the universe 
A)  the reciprocal of their distance from us 
B)  the reciprocal of the square of their distance from us 
C)  their distance form us 
D)  the square of their distance from us 
E)  their distance from the center of the universe

Question 13

A certain process produces baryons that decay with a lifetime of 4 *10-24 s. The decay is a result of:

Accepted Answer

A)  the gravitational interaction 
B)  the weak interaction 
C)  the electromagnetic interaction 
D)  the strong interaction 
E)  some combination of the above 
A)  the gravitational interaction 
B)  the weak interaction 
C)  the electromagnetic interaction 
D)  the strong interaction 
E)  some combination of the above

Question 14

A particle with spin angular momentum   is called a:

Accepted Answer

A)  lepton 
B)  hadron 
C)  fermion 
D)  boson 
E)  electron 
A)  lepton 
B)  hadron 
C)  fermion 
D)  boson 
E)  electron

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

Question 16

An example of a fermion is a:

Accepted Answer

A)  photon 
B)  pion 
C)  neutrino 
D)  kaon 
E)  none of these 
A)  photon 
B)  pion 
C)  neutrino 
D)  kaon 
E)  none of these

Question 17

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 leasr 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 mearly the same in all directions 
A)  is greatest in directions toward the center of the galaxy 
B)  is leasr 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 mearly the same in all directions

Question 18

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 19

Messenger particles of the electromagnetic interaction are called:

Accepted Answer

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

Question 20

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

Accepted Answer

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

Exam 44: Quarks, Leptons, and the Big Bang

In terms of quark content a beta decay can be written:

The quark content of a π\piπ + meson is:

If dark matter did not exist it is likely that:

A baryon with strangeness -1 decays via the strong interaction into two particles, one of which is a baryon with strangeness 0. The other might be:

The baryon number of a quark is:

The quark content of a proton is:

Any baryon is a combination of:

Quarks are the constituents of:

All particles with spin angular momentum :

Hubble's law is evidence that:

A certain process produces mesons that decay with a lifetime of 6 *10-10 s. The decay is a result of:

Objects in the universe are receding from us with a speed that is proportional to:

A certain process produces baryons that decay with a lifetime of 4 *10-24 s. The decay is a result of:

A particle with spin angular momentum is called a:

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

An example of a fermion is a:

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

Strangeness is conserved in:

Messenger particles of the electromagnetic interaction are called:

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

Measurement

Motion Along a Straight Line

Vector

Motion in Two and Three Dimensions

Force and Motion I

Force and Motion II

Kinetic Energy and Work

Potential Energy and Conservation of Energy

Center of Mass and Linear Momentum

Rotation

Rolling, Torque, and Angular Momentum

Equilibrium and Elasticity

Gravitation

Fluids

Oscillations

Waves I

Waves II

Temperature, Heat, and the First Law of Thermodynamics

The Kinetic Theory of Gases

Entropy and the Second Law of Thermodynamics

Electric Charge

Electric Fields

Gauss Law

Electric Potential

Capacitance

Current and Resistance

Circuits

Magnetic Fields

Magnetic Fields Due to Currents

Induction and Inductance

Electromagnetic Oscillations and Alternating Current

Maxwells Equations; Magnetism of Matter

Electromagnetic Waves

Images

Interference

Diffraction

Relativity

Photons and Matter Waves

More About Matter Waves

All About Atoms

Conduction of Electricity in Solids

Nuclear Physics

Energy From the Nucleus

Filters

The quark content of a $\pi$ ⁺ meson is:

A certain process produces mesons that decay with a lifetime of 6 *10^-¹⁰ s. The decay is a result of:

A certain process produces baryons that decay with a lifetime of 4 *10^-²⁴ s. The decay is a result of: