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Physics: PHYA1
Revision Notes: Particles, Quantum Phenomena and Electricity
Atomic structure
This is basically the easy GCSE stuff that you do about the atom, i.e. how many protons, neutrons and
electrons are in a given element, plus a bit extra on forces inside the atom.
Particle Charge Relative Mass
Proton +1 1
Neutron 0 1
Electron -1 0.0005
These are the RELATIVE masses and charges of the particles (i.e.…read more

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Physics: PHYA1
3. When an alpha particle is emitted, the proton number decreases by 2 and the nucleon
number decreases by 4
^^^ this is an example of decay^^^
Another type of decay is decay (beta decay). In decay, you get a tiny neutral particle called an
antineutrino released. The antineutrino carries away some energy and momentum.
3 points to remember about decay;
1. Beta-minus (usually just called beta) decay is the emission of an electron from the neucleus
along with an antineutrino.
2.…read more

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Physics: PHYA1
You usually get electron-positron pairs (rather than any other particle-antiparticle pair) because they
have a relatively small mass
Annihilation
When a particle meets its corresponding anti particle the result is annihilation. All the mass of the
particle and antiparticle gets converted back into energy. Antiparticles can only exist for a fraction of
a second before this happens, so you don't get them in ordinary matter.…read more

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