Physics 7408/3BB June 2021

The AQA A-level Physics Paper 3B (November 2021), Option B (Medical Physics), emphasizes imaging and auditory applications of physics in healthcare. Topics include gamma-ray emission in technetium-99m tracers, photomultiplier tubes in gamma cameras, and biological vs. physical half-life calculations. The paper explores identification of scanning techniques (MRI, CT, PET), sound intensity levels, and frequency-dependent auditory perception. It also addresses X-ray shadow sharpness and lens prescriptions for vision correction, including ray diagrams for myopia. Keywords: AQA Physics, medical physics, gamma tracers, gamma camera, MRI, CT, PET, sound intensity, X-ray imaging, vision correction.