Question 1

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 2

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 3

Color is carried by:

Accepted Answer

A) only quarks 
B) only leptons 
C) only quarks and leptons 
D) only quarks and gluons 
E) only photons and gluons 
A) only quarks 
B) only leptons 
C) only quarks and leptons 
D) only quarks and gluons 
E) only photons and gluons

Question 4

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

Accepted Answer

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

Question 5

Which of the following particles has a lepton number of +1?

Accepted Answer

A) "e+" 
B) " $\mu$ +" 
C) " $\mu$ -" 
D)  " " 
E) "p" 
A) "e+" 
B) " $\mu$ +" 
C) " $\mu$ -" 
D)  " " 
E) "p"

Question 6

When a kaon decays via the strong interaction the products must include a:

Accepted Answer

A) baryon 
B) lepton 
C) strange particle 
D) electron 
E) neutrino 
A) baryon 
B) lepton 
C) strange particle 
D) electron 
E) neutrino

Question 7

Messenger particles of the strong interaction are called:

Accepted Answer

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

Question 8

A galaxy 200 Mpc from us has a recessional velocity of about 14,000 km/s.If it emits radiation at a wavelength of 121 nm, how much is that wavelength shifted when we observe it?

Accepted Answer

A) 5.7 x 10-12 m 
B) 5.7 x 10-10 m 
C) 5.7 x 10-9 m 
D) 5.7 x 10-7 m 
E) 5.7 x 10-6 m 
A) 5.7 x 10-12 m 
B) 5.7 x 10-10 m 
C) 5.7 x 10-9 m 
D) 5.7 x 10-7 m 
E) 5.7 x 10-6 m

Question 9

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 10

How many different flavors of quarks are there (not counting antiquarks)?

Accepted Answer

A) 1 
B) 3 
C) 6 
D) 12 
E) 18 
A) 1 
B) 3 
C) 6 
D) 12 
E) 18

Question 11

The microwave background radiation is a result of the big bang.The big bang also resulted in a uniform distribution of background:

Accepted Answer

A) electrons 
B) quarks 
C) gluons 
D) neutrinos 
E) atoms 
A) electrons 
B) quarks 
C) gluons 
D) neutrinos 
E) atoms

Question 12

All known quarks and antiquarks have:

Accepted Answer

A) charges that are multiples of e and integer baryon numbers 
B) charges that are multiples of e and baryon numbers that are either +1/3 or -1/3 
C) charges that are multiples of e/3 and integer baryon numbers 
D) charges that are multiples of e/3 and baryon numbers that are either +1/3 or -1/3 
E) charges that are multiples of 2e/3 and baryon numbers that are either +1/3 or -1/3 
A) charges that are multiples of e and integer baryon numbers 
B) charges that are multiples of e and baryon numbers that are either +1/3 or -1/3 
C) charges that are multiples of e/3 and integer baryon numbers 
D) charges that are multiples of e/3 and baryon numbers that are either +1/3 or -1/3 
E) charges that are multiples of 2e/3 and baryon numbers that are either +1/3 or -1/3

Question 13

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

Accepted Answer

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

Question 14

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 15

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

Accepted Answer

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

Question 16

The color theory explains why quarks:

Accepted Answer

A) form particles in pairs and triplets 
B) have charge that is a multiple of e/3 
C) have spin 
D) have mass 
E) none of the above 
A) form particles in pairs and triplets 
B) have charge that is a multiple of e/3 
C) have spin 
D) have mass 
E) none of the above

Question 17

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

Accepted Answer

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

Question 18

$\pi$+ represents a pion (a meson), $\pi$- represents a muon (a lepton), ve represents an electron neutrino (a lepton), and v    represents a muon neutrino (a lepton).Which of the following decays might occur?

Accepted Answer

A) "$\pi$+  $\rightarrow$  $\mu$ - + v $\mu$ " 
B) "  $\pi$ +  $\mu$  + + ve" 
C)  " " 
D)  " " 
E) "$\pi$+  $\rightarrow$   $\mu$ + + v $\mu$ " 
A) "$\pi$+  $\rightarrow$  $\mu$ - + v $\mu$ " 
B) "  $\pi$ +  $\mu$  + + ve" 
C)  " " 
D)  " " 
E) "$\pi$+  $\rightarrow$   $\mu$ + + v $\mu$ "

Question 19

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 20

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

Accepted Answer

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

Exam 43: Quarks, Leptons, and the Big Bang

An example of a boson is a:

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:

Color is carried by:

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

Which of the following particles has a lepton number of +1?

When a kaon decays via the strong interaction the products must include a:

Messenger particles of the strong interaction are called:

A galaxy 200 Mpc from us has a recessional velocity of about 14,000 km/s.If it emits radiation at a wavelength of 121 nm, how much is that wavelength shifted when we observe it?

An example of a fermion is a:

How many different flavors of quarks are there (not counting antiquarks)?

The microwave background radiation is a result of the big bang.The big bang also resulted in a uniform distribution of background:

All known quarks and antiquarks have:

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

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

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

The color theory explains why quarks:

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

π\piπ + represents a pion (a meson), π\piπ - represents a muon (a lepton), ve represents an electron neutrino (a lepton), and v represents a muon neutrino (a lepton).Which of the following decays might occur?

Any meson is a combination of:

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

Measurement

Motion Along a Straight Line

Vectors

Motion in Two and Three Dimensions

Force and Motion

Force and Motion

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

Waves

Temperature, Heat, and the First Law of Thermodynamics

The Kinetic Theory of Gases

Entropy and the Second Law of Thermodynamics

Coulombs Law

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 1

Diffraction

Relativity

Photons and Matter Waves

More About Matter Waves

All About Atoms

Conduction of Electricity in Solids

Energy From the Nucleus

Filters

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

$\pi$ ⁺ represents a pion (a meson), $\pi$ ^- represents a muon (a lepton), v_e represents an electron neutrino (a lepton), and v represents a muon neutrino (a lepton).Which of the following decays might occur?