Exam-style question
Try this first
For Physics of vision, which option best uses Doppler ultrasound shift to answer this objective: Describe image formation by the eye.?.
- A.Use Doppler ultrasound shift: using frequency change to infer blood flow, so the answer is anchored to Doppler measurement.
- B.Use a clinical description only, without naming the measured physical signal.
- C.Assume all tissue produces the same detector response, so no useful contrast is formed.
- D.Ignore the limitation or safety factor and treat the method as risk-free.
Model answer
What a good answer should say
- The correct option is Use Doppler ultrasound shift: using frequency change to infer blood flow, so the answer is anchored to Doppler measurement.
Explanation
Why this works
It is correct because Doppler ultrasound shift gives a specific physical mechanism and connects the detector or image evidence to the objective. The other options are incorrect because they either avoid the measured signal, remove contrast or detection detail, or ignore a limitation that AQA medical physics answers should consider.
Common mistake
No common mistake is linked to this question yet.