WJEC A Level Physics
WJEC A Level Physics Option B: Medical Physics Exam Questions
Free WJEC A Level Physics exam questions on Option B: Medical Physics, with mark schemes. Covers X-rays, ultrasound, MRI, PET scans and radiation dosimetry.
Option B: Medical Physics exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
StemUp mark scheme flashcards
A Level Physics Flashcards
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Pick your exam board, then test yourself with the questions on this page.
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About WJEC A Level Physics Option B: Medical Physics
This option applies physics to medicine.
What you need to know
- X-rays Production, attenuation I = I₀e^(−μx) and CT scans.
- Ultrasound Piezoelectric transducers, acoustic impedance and A and B scans.
- MRI and PET Precession, resonance and positron annihilation.
- Dosimetry Absorbed dose, equivalent dose and effective dose.
Common mistakes in Option B: Medical Physics
- Forgetting coupling gel reduces impedance mismatch.
- Confusing absorbed and equivalent dose.
- Wrong attenuation units.
Try three Option B: Medical Physics exam-style questions
1. Explain why gel is used in ultrasound. (2 marks)
Show the mark scheme answer
Air has very different acoustic impedance from skin (1), so gel reduces reflection at the surface (1).
2. State the unit of equivalent dose. (1 mark)
Show the mark scheme answer
Sievert.
3. Explain how PET detects a tracer. (2 marks)
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Positrons annihilate with electrons (1), producing two gamma photons in opposite directions that are detected (1).
Option B: Medical Physics FAQs
What does Medical Physics cover?
X-rays, ultrasound, MRI, PET and dosimetry.
Is this an option?
Yes, it is one of the optional topics on the final paper.
Why use different imaging methods?
Each suits different tissues and has different risks.
Revise this topic with flashcards: A Level Physics Flashcards, with mark scheme answers for Anki and Quizlet.
