Summary
questions on particle physics
1. Consider this neutral atom:
15(a) Name
the constituents of the atom and state how many of each are present
(b) Use
a data sheet to calculate the charge to mass ratio of the two charged components
of the atom.
(c) Nitrogen
has several isotopes - explain the term isotope
2. Calculate the number of constituents of
the following atoms:
(a)
27
(b) 64
2+
(c) 4
2+
(d) 17
2-
Si
Cu
He
O
14
29
2
8
3. (a)
Name the two groups that Hadrons can be divided into
(b) State
the number of quarks in each of these two groups
Describe the arrangement of the quarks in:
(c) protons (d)
neutrons (e)
pions (f)
kaons
4.
What distinguishes Hadrons from other particles?
5. Name
2 Leptons and their corresponding anti-particle.
6. What
distinguishes Leptons from other particles?
7. A
stationary neutron can decay as shown:
n
-> p
+ e-
+ -v-
(a)
Name -v-
and determine its proton number and the nucleon number and , in the
light of your answers, state, giving your reasoning, one property you would
expect of this particle.
(b) Two varieties of quarks are the up and the down. What change in quark structure must occur when a neutron changes into a proton?
(c) Which of the four interaction forces are responsible for the above?
(d) Given
that a quarks can only have a charge of + or - e/3
or + or - 2e/3,
determine the charges on the u and d quarks - and give your reasoning.
8. (a)
Draw a Feynman diagram to represent Beta
- decay.
(b) Describe
in as much detail as possible each stage of the decay
(c) Explain
carefully how charge is conserved at each stage of the decay.
(d) Redraw
the diagram showing the quark transformation, and explain how charge is again
conserved.
(e) Use the data sheet to
help you comment upon whether Baryon number and Strangeness are conserved during
the quark transformation.
9. Repeat question 8. but for Beta + decay.
Answer sheet for these question - it's in Word format - if u have word - if you don't - tough