Unit 1: Energy
Unit 2: Electricity
Unit 3: Particle Model of Matter
Unit 4: Atomic Structure
Unit 5: Forces
Unit 6: Waves
Unit 7: Electromagnetism
Unit 8: Space
Half Life: the time it takes for half the particles to decay.
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Contamination: Unwanted presence of radioactive substances within the body. Ionising: Electrons removed. Irradiation: Being hit by radiation.
Fission: Splitting large atoms, eg uranium. Fusion: Joining small atoms, eg hydrogen
Alpha Scattering Experiment - Rutherford Most atoms went straight through: Atom's nucleus is small. Some were deflected: The nucleus is positively charged. Gold atoms didn't move: The good has more mass.
Alpha: two protons, two electrons: positive charge: stopped by paper: least amount of energy: least penetrating: most ionising
Beta: one electron comes from the nucleus: negative charge: stopped by aluminium: middle amount of energy: Middle penetrating: middle ionising.
Gamma: electromagnetic radiation: no charge: stopped by an inch of steel: most amount of energy: most penetrating: least ionising.
