Physics 7408/3BD June 2019

The AQA Paper 3 Physics exam (June 2019), Section B (Turning points in physics), includes questions on electron diffraction, the wave and corpuscular theories of light, and the historical development of scientific understanding. Key topics involve the measurement of the electron charge using oil droplets, exploring the forces acting on the droplets and determining their radius. The exam covers Newton′s corpuscular theory of light and Huygens′ wave theory, discussing experimental evidence leading to the rejection of Newton′s theory. Additionally, the paper explores de Broglie′s hypothesis, electron diffraction, and how Einstein′s theory of special relativity explains data that deviates from classical predictions.