University of California San Diego Fermions and Bosons Questions Response finish all question show all work…………………………………………

University of California San Diego Fermions and Bosons Questions Response finish all question show all work………………………………………… Question LQ15.1.1:
Matter Particles
u Which
A) There are three generations of spin 1/2
matter particles.
B) Electrons are elementary pointlike particles.
statement
about the
elementary
particles of C) Quarks are elementary pointlike particles.
matter is
D) The first generation of matter particles
false.
accounts for all stable matter.
E) None of the above.
0
Question LQ15.1.2:
1, 2, 3 Interactions
u Which
statement
about the
EM, Weak
and Strong
interactions
is false?
A) The three interactions are all gauge theories.
B) All three theories have vector fields.
C) The strong interactions had been hard to
understand because of quark confinement.
D) The weak interactions had been hard to
understand because of spontaneous symmetry
breaking.
E) None of the above.
1
Question LQ15.2.1:
Fermions and Bosons
u The
elementary
particles that we
have detected are
either spin 1/2
fermions or
integer spin
bosons. Which
statement is
false?
A) Bosons can be created singly.
B) Fermions must be created in
pairs (with antiparticle).
C) No two identical Bosons can be
in the same state.
D) Fermions take up space.
E) The Higgs boson is spin 0.
2
Question LQ15.2.2:
Higgs Mechanism
A) Before spontaneous symmetry
breaking, all particles are massless.
statement
about the Higgs B) The Higgs particle breaks the symmetry
by changing the vacuum.
mechanism in
spontaneous
C) Particles get masses due to their
symmetry
interaction with the Higgs.
breaking is
D) A large amount of energy is released as
false?
the vacuum goes to a lower energy state.
E) We can heat up the vacuum with a torch
3
to restore the symmetry.
u Which
Question LQ16.1.1:
Age of the Universe
u What
is the age A) The universe has existed forever.
of the
universe?
B) We don’t know.
C) About 14 billion years.
D) About 100 trillion years.
E) Less than 1 million years.
4
Question LQ16.2.1:
Understanding the Universe
u What
major
aspect of the
universe do we
understand.
A) The cause of the big bang.
B) What the dark matter is.
C) What the dark energy is.
D) The origin of the cosmic microwave
background.
E) The ultimate fate of the universe.
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