Physics 7408/3BB June 2019

The AQA Paper 3 Physics exam (June 2019), Section B (Medical Physics), includes questions on vision correction, sound intensity, X-ray production, and the use of ultrasound in medical diagnostics. Key topics include identifying eye defects, using corrective lenses, and calculating sound intensity at different distances from a loudspeaker. The exam also covers the production of continuous and characteristic spectra in X-ray tubes, the effect of increasing the anode potential difference, and filtering of X-rays. Additionally, it discusses ultrasound A-scans for measuring eye length, the choice of scan for medical procedures like amniocentesis, and the advantages and disadvantages of A- and B-scans.