Exam-style question
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Evaluate a student answer to Describe The Conditions Needed For Sustained Interference: what must be included for full A-Level credit?.
Model answer
What a good answer should say
- Method Chain response 69921b: state Describe the conditions needed for sustained interference., apply phase difference, path difference, stationary wave, progressive wave, diffraction, and finish with the physical consequence for Refraction, diffraction and interference.
Explanation
Why this works
Stem being answered: Evaluate a student answer to Describe The Conditions Needed For Sustained Interference: what must be included for full A-Level credit? Route focus: waves / Refraction Diffraction And Interference.
Key vocabulary for this item: conditions, needed, sustained, interference. Written check: state the principle, apply it to the named context, and close with the requested conclusion.
The explanation should keep the answer tied to these exact words rather than a general physics summary, using units, graph evidence or equation reasoning only when they are relevant to the stem.
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