Checklist for AQA AS Physics Unit 1

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  • Created on: 13-01-15 14:26
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Particles and Constituents of the Atom
Radiation Proton, neutron and electron.
Their charge and mass in SI units and relative units
Specific charge of nuclei and of ions
Proton number Z, nucleon number A, nuclide
notation, isotopes
Stable and Unstable Nuclei
The strong nuclear force; its role in keeping the
nucleus stable; short range attraction to about 3fm,
very short range repulsion below about 0.5fm
Know the equations for alpha and B- decay including
the antineutrino
Particles, antiparticles and photons
For every particle there is a corresponding antiparticle
The positron, the antiproton, the antineutron and the
antineutrino are antiparticles of the electron, proton,
the neutron and the neutrino respectively
Comparison of particle and antiparticle masses,
charge rest energy in MeV
Photon model of electromagnetic radiation, the
Planck constant,
Knowledge that annihilation and pair production
processes and the respective energies involved.
E=mc^2 is not required in calculation
Particle interactions
Concept of exchange particles to explain forces
between elementary particles
The electromagnetic force; virtual protons as the
exchange particle
Weak interaction limited B-,B+ decay, electron
capture and electron-proton collisions; W+ and W- as
the exchange particles.
Simple Feynman diagrams to represent the above
reactions or interactions in terms of particles going in
and out and exchange particles
Classification of particles
Hadrons:baryons (proton, neutron) and antibaryons
(antiproton and antineutron) and mesons (pion,kaon)
Hadrons are a subject to the strong nuclear force
The proton is the only stable baryon into which other
baryond eventually decay; in particular, the decay of
the neutron should be known
Leptons: electron, muon, neutrino (electron and
muon types)
Leptons are subject to the weak interaction

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Know baryon numbers for hadrons. Leptons number
for leptons will be in data booklet.
Quarks and antiquarks
Up (u), down (d) and strange (s) quarks only
Properties of quarks: charge, baryon number and
Combinations of quarks and antiquarks required for
baryons (proton and neutron only), antibaryons
(antiproton and antineutron only) and meson (pion
and kaon) only
Change of quark character in B- and B+ decay
Application of the conservation laws for charge,
baryon number, lepton numbger and strangeness to
particle interactions
1.…read more

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Description of the qualiative effect of temperature on
the resistance of metal conductors and thermistors.
Applications (temperature sensors)
Superconductivity as a property of certain materials
which have zero resistivity at and below a critical
temperature which depends on the material.
Applications (e.g. very strong electromagnets, power
Resistors in series; R=R1+R2+R3
Resistors in parallel 1/R=1/R1+1/R2+1/R3
Energy E=IVt, P=IV, P=I^2R; application, e.g.…read more


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