Physics 7408/3BB June 2020

The AQA A-level Physics Paper 3B (November 2020), Option B (Medical Physics), examines core medical imaging and auditory concepts. Key topics include visual perception under varying light conditions, sound wave mechanics in the ear, and X-ray photon interactions. Questions cover image formation in dark adaptation, ossicular pressure amplification, attenuation coefficients for radiotherapy, and transducer operations in ultrasound diagnosis. Students explore methods to reduce radiation exposure, calculate ultrasound resolution, and analyze acoustic impedance in lung tissue. Emphasis lies on understanding biological applications of physics principles. Keywords: AQA Physics, medical physics, radiotherapy, ultrasound imaging, X-ray attenuation, ossicles, visual adaptation.