AQA A Level Physics Paper 3bb 2025 Mark Scheme

Download the official AQA A-Level Physics Paper 3 Section B Medical Physics mark scheme for the June 2025 examination series (7408/3BB). This examiner-approved v1.0 final mark scheme contains the complete set of accepted answers, worked calculations, graph-analysis guidance, practical reasoning, level-of-response criteria, and examiner annotations used during the official AQA marking process for the 2025 Medical Physics optional-topic assessment.

The mark scheme provides detailed examiner guidance for every Medical Physics question in the paper, including eye accommodation and focal-length calculations, hypermetropia interpretation, technetium-99m decay calculations, radioactive tracer analysis, MUGA and transthoracic echocardiogram (TTE) comparisons, threshold-of-hearing definitions, equal-loudness curve interpretation, sound-intensity power calculations, rotating-anode X-ray tube focal spots, patient radiation-protection methods, and attenuation of X-rays through a femur cross-section.

Students can use this document to understand exactly how marks are awarded for calculations, graph interpretation, extended written explanations, scientific reasoning, and Medical Physics application questions in A-Level Physics Paper 3BB. The mark scheme also includes official guidance on consequential marking, significant figures, level-of-response assessment, acceptable alternative methods, graph-sketch requirements, and examiner tolerances for calculations and written explanations. Pair this mark scheme with the matching AQA 7408/3BB June 2025 question paper on markscheme.net for complete examiner-standard revision, accurate self-marking, mock-exam assessment, and advanced Medical Physics exam preparation before the 2026 A-Level Physics examinations.

This document is designed for AQA A-Level Physics students studying the 7408 specification and taking the Medical Physics optional topic, especially Year 13 students preparing for the 2026 examination series who want to improve exam technique using official examiner guidance and authentic mark allocations. It is particularly valuable for high-achieving students targeting A and A* grades who need to understand how calculation marks, graph-analysis marks, explanation marks, and level-of-response marks are awarded in Medical Physics assessments.

The mark scheme is also highly useful for Physics teachers, tutors, sixth-form colleges, revision centres, home-schooled learners, and retake candidates who require official AQA marking guidance for mock examinations, classroom assessment, homework marking, topic testing, and structured revision programmes. It helps learners strengthen scientific reasoning, graph interpretation, calculation structure, radiation-physics understanding, and medical-imaging analysis under real AQA standards.