AQA 7408 A-Level Physics coverage of turning points in physics (3.12 — optional D): the discovery of the electron (Thomson cathode-ray experiment, specific-charge measurement); Millikan oil-drop experiment and quantisation of charge; the wave-particle debate from Newton vs Huygens to the 19th century; electromagnetic waves and Maxwell's synthesis; the photoelectric effect and quantum pioneers (Planck, Einstein); electron diffraction and de Broglie wave-particle duality; the Michelson-Morley experiment and the aether problem; special relativity (time dilation, length contraction, mass-energy equivalence). Optional unit — students only need this course if their school chose option D.
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