Physics Worksheet Lesson 30 Standard Model

Physics Worksheet
1
Quantum Physics
The Fundamental Forces
a.
e.
Four Fundamental Forces: There are four
fundamental forces in nature. Arrange them
from the strongest to the weakest.
f.
(3) _________________________________
g.
Among the four fundamental forces:
Long-range forces: ____________________
________________________ is responsible
for the decay of some nuclear particles.
e.
In modern physics, particles are force
carriers, because forces are brought about as
a result of an
(1) _________________________________
(2) _________________________________
(3) _________________________________
h.
Classification of Matter
a.
Positrons – A particle whose ____________
is the same as electron’s, and whose
________________ is equal in magnitude
but opposite in sign to the electron’s.
___________________________________.
2
Lepton – a particle that interacts through
gravitational, weak, and electromagnetic
forces, but not the ____________________
is called a lepton. A lepton is much lighter
than a proton. Examples of leptons are
Short-range forces: ____________________
d.
Mesons – a meson is a particle of
intermediate mass. A meson is made of
________________ and _______________.
(4) _________________________________
______________________________ holds
the nucleon (protons and neutrons) together.
Baryons – a baryons is an elementary
particle that can be transformed into a
A baryon is made of __________________.
(2) _________________________________
c.
Name:
_________________ or ________________
and some number of mesons and lighter
particles.
(1) _________________________________
b.
Section:
Particles are classified according to the
___________________________________.
they have with other particles.
b.
all four forces
protons,
neutrons
If the force carrier particles (such as gluons,
gravitons, etc.) are excluded, all particles
can be classified into two groups –
except strong force
electrons,
positions,
neutrinos
________________ and _______________.
c.
Hadron –
___________________________________.
d.
The hadrons can be subdivided into
no. of quark –
no. of antiquark = 3
(B =1)
________________ and ________________
no. of quark =
no. of antiquark (B = 0)
according to their ____________________.
The baryon number is defined as:
____________________________
where
i.
N is the number of ____________
N is the number of ____________
q
Neutrino – a neutrino is a ______________
particle that has little mass but does possess
both energy and momentum.
q
Both of them are composed of more
€
fundamental particles called ____________.
€
Mr. Lin
3
The Antiparticle
1