Question 1

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

Question 2

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 3

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 4

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 5

The two basic interactions that have finite ranges are:

Accepted Answer

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

Question 6

The baryon number of a quark is:

Accepted Answer

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

Question 7

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 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

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

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

The interaction $\pi$- + p  $\rightarrow$  $\pi$- +    + violates the principle of conservation of:

Accepted Answer

A) baryon number 
B) lepton number 
C) strangeness 
D) angular momentum 
E) none of these 
A) baryon number 
B) lepton number 
C) strangeness 
D) angular momentum 
E) none of these

Question 12

Which of the following particles has a lepton number of zero?

Accepted Answer

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

Question 13

An electron participates in:

Accepted Answer

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

Question 14

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 15

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 16

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 17

Different types of neutrinos can be distinguished from each other by:

Accepted Answer

A) the directions of their spins 
B) the leptons with which they interact 
C) the baryons with which they interact 
D) the number of photons that accompany them 
E) their baryon numbers 
A) the directions of their spins 
B) the leptons with which they interact 
C) the baryons with which they interact 
D) the number of photons that accompany them 
E) their baryon numbers

Question 18

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 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

Exam 43: Quarks, Leptons, and the Big Bang

If dark matter did not exist it is likely that:

Which of the following particles is stable?

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

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

The two basic interactions that have finite ranges are:

The baryon number of a quark is:

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?

Quarks are the constituents of:

A baryon is a combination of:

Hubble's law is evidence that:

The interaction π\piπ - + p →\rightarrow→ π\piπ - + + violates the principle of conservation of:

Which of the following particles has a lepton number of zero?

An electron participates in:

In order of increasing strength the four basic interactions are:

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

Messenger particles of the weak interaction are called:

Different types of neutrinos can be distinguished from each other by:

Dark matter is suspected to exist in the universe because:

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

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 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?

The interaction $\pi$ ^- + p $\rightarrow$ $\pi$ ^- + $The interaction \pi <sup>-</sup> + p \rightarrow \pi <sup>-</sup> + <sup>+</sup> violates the principle of conservation of:$ ⁺ violates the principle of conservation of:

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