Question 1

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 2

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 3

Which of the following particles is stable?

Accepted Answer

A) Neutron 
B) Proton 
C) Pion 
D) Muon 
E) Kaon 
A) Neutron 
B) Proton 
C) Pion 
D) Muon 
E) Kaon

Question 4

Baryonic matter (protons and neutrons)comprises what fraction of the total energy of the universe?

Accepted Answer

A) about 1% 
B) about 4% 
C) about 23% 
D) about 73% 
E) almost 100% 
A) about 1% 
B) about 4% 
C) about 23% 
D) about 73% 
E) almost 100%

Question 5

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 6

The mass of the W boson is 80 GeV/c2.During beta decay, a virtual W is created.In order not to visibly violate conservation of energy, what is the longest time the W particle can be in existence?

Accepted Answer

A) 0 s 
B) 8 x 10-45 s 
C) 8 x 10-36 s 
D) 8 x 10-27 s 
E) There is no limit on the time the W can exist. 
A) 0 s 
B) 8 x 10-45 s 
C) 8 x 10-36 s 
D) 8 x 10-27 s 
E) There is no limit on the time the W can exist.

Question 7

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 8

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 9

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 10

Dark matter is suspected to exist in the universe because:

Accepted Answer

A) the night sky is dark between stars 
B) the orbital period of stars in the outer parts of a galaxy is greater than the orbital period of stars near the galactic center 
C) the orbital period of stars in the outer parts of a galaxy is less than the orbital period of stars near the galactic center 
D) the orbital period of stars in the outer parts of a galaxy is about the same as the orbital period of stars near the galactic center 
E) all galaxies have about the same mass 
A) the night sky is dark between stars 
B) the orbital period of stars in the outer parts of a galaxy is greater than the orbital period of stars near the galactic center 
C) the orbital period of stars in the outer parts of a galaxy is less than the orbital period of stars near the galactic center 
D) the orbital period of stars in the outer parts of a galaxy is about the same as the orbital period of stars near the galactic center 
E) all galaxies have about the same mass

Question 11

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 12

Messenger particles of the weak 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 13

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 14

A neutron cannot decay into a neutrino and an antineutrino.This decay would violate baryon number conservation and which other conservation law?

Accepted Answer

A) Energy 
B) Lepton number 
C) Electric charge 
D) Linear momentum 
E) Angular momentum 
A) Energy 
B) Lepton number 
C) Electric charge 
D) Linear momentum 
E) Angular momentum

Question 15

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

Question 16

A neutral lepton cannot decay into two neutrinos.Of the following conservation laws, which would be violated if it did?

Accepted Answer

A) Energy 
B) Baryon number 
C) Linear Momentum 
D) Angular momentum 
E) None of the above 
A) Energy 
B) Baryon number 
C) Linear Momentum 
D) Angular momentum 
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

A particle can decay to particles with greater rest mass:

Accepted Answer

A) only if antiparticles are produced 
B) only if photons are also produced 
C) only if neutrinos are also produced 
D) only if the original particle has kinetic energy 
E) never 
A) only if antiparticles are produced 
B) only if photons are also produced 
C) only if neutrinos are also produced 
D) only if the original particle has kinetic energy 
E) never

Question 19

A down quark can be changed into an up quark (plus other particles perhaps)by:

Accepted Answer

A) the gravitational interaction 
B) the weak interaction 
C) the electromagnetic interaction 
D) the strong interaction 
E) none of these 
A) the gravitational interaction 
B) the weak interaction 
C) the electromagnetic interaction 
D) the strong interaction 
E) none of these

Question 20

A 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

Exam 44: Quarks, Leptons, and the Big Bang

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

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?

Which of the following particles is stable?

Baryonic matter (protons and neutrons)comprises what fraction of the total energy of the universe?

A particle with spin angular momentum is called a:

The mass of the W boson is 80 GeV/c2.During beta decay, a virtual W is created.In order not to visibly violate conservation of energy, what is the longest time the W particle can be in existence?

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

Messenger particles of the electromagnetic interaction are called:

Hubble's law is evidence that:

Dark matter is suspected to exist in the universe because:

The color theory explains why quarks:

Messenger particles of the weak interaction are called:

All known quarks and antiquarks have:

A neutron cannot decay into a neutrino and an antineutrino.This decay would violate baryon number conservation and which other conservation law?

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

A neutral lepton cannot decay into two neutrinos.Of the following conservation laws, which would be violated if it did?

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:

A particle can decay to particles with greater rest mass:

A down quark can be changed into an up quark (plus other particles perhaps)by:

A baryon is a combination of:

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

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

The mass of the W boson is 80 GeV/c².During beta decay, a virtual W is created.In order not to visibly violate conservation of energy, what is the longest time the W particle can be in existence?