AQA A level physics particles and radiation
questions
1. What kind of photon is produced in annihilation?: gamma
2. State what roles exchange particles can play in an interaction: -
Transfers energy
-transfers momentum
-Transfers force
3. What is pair production?: Pair production is when one high energy
photon spontaneously turns into a particle-antiparticle pair
4. Give one difference and one similarity between a negative muon and
an electron: Difference: The muon decays but the electron does not
Similarity: Both are negatively charged
5. What is the equation for the threshold frequency in terms of the
work function?: f=work function/h
6. Explain why the strong nuclear force must be repulsive at very short
dis- tances: Because it would crash the nucleus to a point
7. Describe the changes that happen in the nucleus during alpha and beta-
mi- nus decay: -alpha decay: proton number decreases by two and the
nucleon number decreases by four
-beta decay: proton number increases by one and the nucleon
number stays the same.
8. Is the strong interaction attractive or repulsive at a nucleon separation
of 2fm?: attractive
9. State what is meant by an isotope: atoms with the same number of
protons but different number of neutrons
10.Describe the nuclear model of the atom?: Inside every atom there is a
nucleus which contains protons and neutrons. orbiting this are the
electrons
11.How could you calculate the specific charge of a particle?:
specific charge=charge/mass
12.Define the proton number and the nucleon number: proton
number=how many protons there are in the nucleus
nucleon number=mass number. Tells you how many protons and
neutrons there are in the nucleus
13.What are the two types of hadrons?: -Baryons
-mesons
14.Who proposed the photon theory of light?: Albert Einstein
15.What is the quark composition of a proton?: uud
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, 16.According to the wave theory of light, what should the maximum
kinetic energy of emitted electrons be proportional to?: Intensity
17.How many different types of quark are threre?: 6
18.In what interaction is strangeness conserved?: Strong nuclear
interaction
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