Curriculum
Course: American System Physics
time left:
:
:
Login

Curriculum

American System Physics

A Physics Toolkit

0/9

Representing Motion

0/9

Accelerated Motion

0/9

Forces in One Dimension

0/9

Displacement and Force in Two Dimensions

0/9

Motion in Two Dimensions

0/9

Gravitation

0/9

Rotational Motion

0/9

Momentum and Its Conservation

0/9

Energy and Its Conservation

0/9

Thermal Energy

0/9

States of Matter

0/9

Vibrations and Waves

0/9

Sound

0/9

Fundamentals of Light

0/9

Reflection and Refraction

0/9

Interference and Diffraction

0/9

Electrostatics

0/9

Electric Current and Circuits

0/9

Magnetic Fields

0/9

Electromagnetic Induction and Electromagnetism

0/9

Quantum Theory and the Atom

0/9

Solid-State Electronics

0/9

Nuclear and Particle Physics

0/9
Quiz

24.3 The Building Blocks of Matter – Quiz

Submit quiz
Once you submit, you will no longer be able to change your answers. Are you sure you want to submit the quiz?
Cancel Submit

Building Blocks of Matter American Physics quiz: free practice for American System Physics. Work through this Building Blocks of Matter American Physics quiz and get instant feedback on every answer. If you get stuck, review the 24.3 The Building Blocks of Matter — Notes lesson. More practice: American System Physics — all units. Syllabus: OpenStax free science textbooks.

  • Questions count: 50
  • Passing grade: A-
  • Time limit:
Start Quiz
1.
What is an elementary particle?
A particle that is not made of any smaller particles
Any particle found in the nucleus
A particle made of three quarks
A particle with no charge
2.
Which list contains only leptons?
Proton, neutron, electron
Electron, muon, tau neutrino
Up quark, electron, photon
Pion, muon, gluon
3.
Each fundamental force has an exchange particle. Select the correct match.
Strong - gluon
Weak - photon
Electromagnetic - gluon
Gravitational - W boson
4.
How far does each interaction reach? Choose the force given its correct range.
Strong - infinite
Weak - about 10^-18 m
Electromagnetic - about 10^-15 m
Gravitational - about 10^-18 m
5.
A student sorts particles into families. Which particle has been classified correctly?
Electron - hadron
Pion - baryon
Neutron - baryon
Proton - lepton
6.
Matter-antimatter processes: which description matches its name correctly?
Annihilation - a photon splits into two electrons
Pair production - a particle and antiparticle become photons
Annihilation - creates mass from nothing
Pair production - a photon creates a particle and its antiparticle
7.
What does the Higgs boson explain in the Standard Model?
How particles acquire mass
Why quarks have fractional charge
How gravity is carried
Why neutrinos have charge
8.
The sigma-plus particle is a baryon made of up, up and strange quarks. What is its charge in units of e?
0
-1
+1
+2
9.
A kaon contains a strange quark and an anti-up quark. What is its charge?
+1
-1
0
-1/3
10.
Which quark combination gives a particle of charge +2e?
uud
udd
uuu
ddd
11.
What is the rest energy of an electron (mass 9.11 x 10^-31 kg) in joules?
8.20e-14 J
2.73e-22 J
0.512 J
4.10e-14 J
12.
What is the minimum photon energy needed to produce an electron-positron pair?
0.511 MeV
1.02 MeV
2.04 MeV
931.5 MeV
13.
An electron and positron at rest annihilate into two identical photons. What is the wavelength of each photon?
1.22e-12 m
3.89e-25 m
2.43e-12 m
4.87e-12 m
14.
What is the minimum photon energy needed to create a proton-antiproton pair (proton mass 1.67 x 10^-27 kg)?
1879 MeV
939 MeV
1.02 MeV
3758 MeV
15.
In a linear accelerator a proton passes through a total p.d. of 2.0 x 10^6 V. What kinetic energy does it gain?
2.0e+06 J
3.2e-13 J
1.2e+25 J
2.0 J
16.
A proton moving at 2.0e+06 m/s enters a 0.5 T magnetic field at right angles. What is the radius of its path?
2.67e-40 m
24 m
76.7 m
0.042 m
17.
Inside a detector, an electron travelling at 2.0 x 10^6 m/s curls round in a 0.50 T field. Find the radius of its circular track.
2.28e-05 m
4.18e-02 m
2.28e-02 m
1.46e-43 m
18.
A gamma photon produces an electron and a positron at the origin. The diagram shows tracks A and B curving equally in opposite directions. Which statement is correct?
Dr Dabour Hub Academy - figure 1
A and B are both electrons
A and B are the electron and positron; equal radii show equal mass and speed, opposite curvature shows opposite charge
C is the positron
A and B are neutrinos
19.
Particles 1, 2 and 3 in the diagram have the same speed and the same size of charge. Which has the largest mass?
Dr Dabour Hub Academy - figure 2
Particle 1
Particle 3
All have equal mass
Particle 2
20.
Using the chart, how many times stronger is the electromagnetic force than the weak force?
Dr Dabour Hub Academy - figure 3
10^-4
10^4
10^8
4
21.
In the flow diagram of a particle accelerator, what is the role of the magnetic fields?
Dr Dabour Hub Academy - figure 4
To give the particles energy
To detect the particles
To create antiparticles directly
To steer and focus the beam into a circular path
22.
The gamma spectrum shows a sharp peak. What process most likely produces these photons?
Dr Dabour Hub Academy - figure 5
Pair production by 1.02 MeV photons
Annihilation of positrons with electrons at rest
Alpha decay
Proton-antiproton annihilation
23.
Using the table, what is the charge of a particle made of charm, down and down quarks?
+1
-1
0
+2/3
24.
Using the table, which combination could be a meson of charge +1?
up and anti-up
down and anti-up
up, up, down
up and anti-strange
25.
Using the table, which pairing is correct?
F3 - weak force
F1 - strong force
F2 - electromagnetic force
F4 - gravitational force
26.
Which force in the table is carried by gluons?
F1
F2
F3
F4
27.
Using the table, what minimum photon energy could create a muon and an antimuon?
105.7 MeV
1.02 MeV
52.9 MeV
211.4 MeV
28.
Using the table, how many times more massive is a muon than an electron?
about 207
about 2
about 1836
about 106
29.
X and Y in the table were created together from a single photon. What are they most likely to be?
Two protons
An electron and a positron
A proton and a neutron
Two photons
30.
In a detector, why is a magnetic field applied across the region where particles travel?
To accelerate the particles
To slow neutrinos
To stop gamma rays
Curvature direction shows charge sign and radius gives momentum, identifying particles
31.
Why are neutrinos very hard to detect?
They are uncharged, almost massless and interact only through the weak force
They move slowly
They are strongly ionising
They decay instantly
32.
A researcher wants to create heavier particles in collisions. Which change to an accelerator is most effective?
Reduce the magnetic field so particles move in straight lines
Increase the energy given to the colliding beams
Use neutral particles only
Lower the collision rate
33.
The exchange particle of the electromagnetic force is the _____.
gluon
photon
W boson
graviton
34.
A hadron made of three quarks is called a _____.
meson
lepton
baryon
boson
35.
In beta-minus decay, a down quark changes into a(n) _____ quark.
strange
down
top
up
36.
A baryon with quark content d d s has a total charge of _____ e.
-1
0
+1
-1/3
37.
The minimum frequency of a photon for pair production of an electron and positron is _____.
1.23e+20 Hz
1.54e+33 Hz
1.83e+21 Hz
2.47e+20 Hz
38.
Leptons feel the strong force. True or false?
True
True only for neutrinos
False, because leptons do not feel the strong force
False, because leptons feel no forces at all
39.
A meson is made of a quark and an antiquark. True or false?
False, it is made of three quarks
False, it is a lepton
True only for protons
True
40.
The positron has the same mass as the electron but opposite charge. True or false?
True
False, it has twice the mass
False, it has the same charge
True only in a magnetic field
41.
Neutrinos interact only very weakly with matter. True or false?
False, they are strongly ionising
True
False, they carry large charge
True only in lead
42.
A positive pion consists of an up quark and an anti-down quark, giving a total charge of +1e. True or false?
False, it is 0
False, it is +1/3 e
True only for the antipion
True
43.
A baryon made of three down quarks would have charge -1e. True or false?
False, it would be 0
False, it would be -3e
True only for antiparticles
True
44.
An ion source gives each proton 5.0 kV of acceleration, which is 8.0 x 10^-16 J of kinetic energy. True or false?
False, it is 5.0 x 10^3 J
False, it is 3.1 x 10^22 J
True
True only for electrons
45.
The nearly straight track C in the diagram belongs to a particle of much larger momentum (or smaller charge-to-momentum ratio) than A and B. True or false?
Dr Dabour Hub Academy - figure 6
False, it belongs to a slower particle
False, C must be a neutral particle
True
True only if the field is zero
46.
In the diagram, particles 1 and 3 have opposite charges. True or false?
Dr Dabour Hub Academy - figure 7
True
False, they have the same charge
False, one is uncharged
True only if they are photons
47.
From the chart, gravity can be ignored when studying interactions between individual subatomic particles. True or false?
Dr Dabour Hub Academy - figure 8
False, it is the strongest force
False, it dominates at short range
True
True only for neutrinos
48.
According to the flow diagram, new particles are produced when kinetic energy of colliding beams is converted into mass. True or false?
Dr Dabour Hub Academy - figure 9
True
False, they are produced by the detectors
False, mass is destroyed
True only for gamma rays
49.
The table shows a proposed decay n -> p + e- + electron antineutrino conserves charge, baryon number and lepton number. True or false?
False, charge is not conserved
False, baryon number changes
True
False, lepton number changes
50.
Particle Z in the table has a mass roughly 1850 times that of X if it has the same speed and charge magnitude. True or false?
False, it is lighter
False, radius does not depend on mass
True
True only if B is zero
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
Part of Nuclear and Particle Physics — see every lesson and quiz in this unit.
Accepted payment methods