Physics 7408/3BA June 2023

The AQA A-level Physics Paper 3B (June 2023), Option A (Astrophysics), examines stellar evolution, astronomical measurements, and cosmic phenomena. Topics include parsec definition, Hertzsprung-Russell diagram, black holes, and gamma-ray bursts. Questions explore the properties of telescopes, the event horizon radius, and orbital speeds of stars near black holes. Students calculate star distances, apparent magnitudes, and the Hubble constant to estimate the Universe′s age. Discussions cover the color and brightness of binary stars and observational advancements through CCDs. Keywords: AQA Physics, astrophysics, stellar evolution, black holes, Hertzsprung-Russell, telescopes, Hubble constant, gamma-ray bursts.