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Physics: PHYA1

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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

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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…

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You usually get electron-positron pairs (rather than any other particle-antiparticle pair) because they
have a relatively small mass


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…


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