Quiz 7.1
Space-Time Revisited
1. In Feynman diagrams, positive energy
anti-particles are understood as
a) Negative energy going backwards in time
b) Positive energy going sideways in time
c)
Negative energy going forwards in time
d) Positive energy going backwards in time
2. What is directly detected by a PET scan?
a) Electrons
b) Positrons
c) Gamma photons
d) Atoms
3. Changes in the number of particles are a
consequence of
a) Inertial frame independence of laws
b) Conservation of energy
c) Electric force of attraction
d) Negative energy
4. The basic vertex in any QED space-time Feynman diagram involves
a) One electron or positron and one photon
b) Two electrons or positrons and one photon
c) One electron or positron and two photons
d) Two electrons or positrons and two photons
Quiz 7.2
Particles and Force-Fields
1. What is a virtual particle?
a) One that has negative energy
b) One that goes backwards in time
c) One that exists for only a short time
d) One that can split into other particles
2. Force is understood in particle physics as
a) An attraction between virtual particles
b) The anti-particle of a virtual particle
c) Negative energy going backward in time
d) The exchange of virtual particles
3. A photon may scatter from an electron via a virtual
a) Photon
b) Electron
c) Proton
d) Compton
4. “Empty space” is never in fact empty because there is always some
probability
a) To create particles from nothing
b) To tunnel to a parallel universe
c) For matter and anti-matter to annihilate
d) For space-time to eat its tail
Quiz 7.3
The Standard Model
1. Which force is not described by the
Standard Model of particle physics?
a) Weak nuclear
b) Gravity
c) Strong nuclear
d) Electromagnetic
2. Which particle is associated with the
cause of inertial mass?
a) Photon
b) Higgs
c) Electron
d) Neutrino
3. All particles in nature fall into one of two
classes
a) Gluons and Hadrons
b) Quarks and Leptons
c) Bosons and Fermions
d) Electrons and Positrons
4. Which of the following phenomena is not
attributed to a condensation effect?
a) Superconductivity
b) Quark confinement
c) Radioactive β decay
d) Inertial mass
Quiz 7.4
Unsolved Mysteries
1. Which of the following mysteries is
already completely solved?
a) The rotation of galaxies
b) The deficit of anti-matter
c) The acceleration of the expanding universe
d) The stability of atoms
2. The Standard Model accounts for
a) All of the mass and energy in the universe
b) Most of the mass and energy in the universe
b) Little of the mass and energy in the universe
b) None of the mass and energy in the universe
3. What is Dark Matter?
a) Energy of empty space
b) Superman’s nemesis
c) Your country’s tax code
d) Invisible mass
4. What is Dark Energy?
a) Energy of empty space
b) Princess Leia’s dad
c) Your country’s tax inspector
d) Invisible mass