Exam-style question
Try this first
A student makes a mistake while revising Describe The Conditions Needed For Sustained Interference. Which correction is most accurate?.
- A.A. The correction is to keep describe the conditions needed for sustained interference separate from the common neighbouring idea in Refraction, diffraction and interference, then explain the tested distinction.
- B.B. The mistake is harmless because the two ideas always mean the same thing.
- C.C. The correction is to memorise the wording without explaining the distinction.
- D.D. The answer should move to a different Refraction, diffraction and interference topic instead of fixing the misconception.
Model answer
What a good answer should say
- Field Direction answer 2b6a23: A.
- The correction is to keep describe the conditions needed for sustained interference separate from the common neighbouring idea in Refraction, diffraction and interference, then explain the tested distinction.
- is correct because it matches Describe the conditions needed for sustained interference.
- through phase difference, path difference, stationary wave, progressive wave.
Explanation
Why this works
Stem being answered: A student makes a mistake while revising Describe The Conditions Needed For Sustained Interference. Which correction is most accurate?
Route focus: waves / Refraction Diffraction And Interference. Key vocabulary for this item: conditions, needed, sustained, interference.
Option check: keep Field Direction answer 2b6a23: A because it matches the stem; reject alternatives that change conditions, needed, sustained or use a neighbouring model. 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.
Common mistake
No common mistake is linked to this question yet.