1. Physics Worksheet Quantum Physics Section: Name:
Mr. Lin 1
1 The Fundamental Forces
a. Four Fundamental Forces: There are four
fundamental forces in nature. Arrange them
from the strongest to the weakest.
(1) _________________________________
(2) _________________________________
(3) _________________________________
(4) _________________________________
b. Among the four fundamental forces:
Long-range forces: ____________________
Short-range forces: ____________________
c. ______________________________ holds
the nucleon (protons and neutrons) together.
d. ________________________ 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
___________________________________.
2 Classification of Matter
a. Particles are classified according to the
___________________________________.
they have with other particles.
b. If the force carrier particles (such as gluons,
gravitons, etc.) are excluded, all particles
can be classified into two groups –
________________ and _______________.
c. Hadron –
___________________________________.
d. The hadrons can be subdivided into
________________ and ________________
according to their ____________________.
The baryon number is defined as:
____________________________
where
€
Nq
is the number of ____________
€
Nq
is the number of ____________
Both of them are composed of more
fundamental particles called ____________.
e. Baryons – a baryons is an elementary
particle that can be transformed into a
_________________ or ________________
and some number of mesons and lighter
particles.
A baryon is made of __________________.
f. Mesons – a meson is a particle of
intermediate mass. A meson is made of
________________ and _______________.
g. 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
(1) _________________________________
(2) _________________________________
(3) _________________________________
h. Positrons – A particle whose ____________
is the same as electron’s, and whose
________________ is equal in magnitude
but opposite in sign to the electron’s.
i. Neutrino – a neutrino is a ______________
particle that has little mass but does possess
both energy and momentum.
3 The Antiparticle
all four forces
protons,
neutrons
except strong force
electrons,
positions,
neutrinos
no. of quark =
no. of antiquark (B = 0)
no. of quark –
no. of antiquark = 3
(B =1)