Exam-style question
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A student makes a mistake while revising Describe Doppler Shift For Waves From Moving Sources. Which correction is most accurate?.
- A.A. The correction is to keep describe doppler shift for waves from moving sources separate from the common neighbouring idea in Cosmology, 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 Cosmology topic instead of fixing the misconception.
Model answer
What a good answer should say
- Signal Path answer abaded: A.
- The correction is to keep describe doppler shift for waves from moving sources separate from the common neighbouring idea in Cosmology, then explain the tested distinction.
- is correct because it matches Describe Doppler shift for waves from moving sources.
- through phase difference, path difference, stationary wave, progressive wave.
Explanation
Why this works
Stem being answered: A student makes a mistake while revising Describe Doppler Shift For Waves From Moving Sources. Which correction is most accurate?
Route focus: astrophysics / Cosmology. Key vocabulary for this item: doppler, shift, waves, moving, sources.
Option check: keep Signal Path answer abaded: A because it matches the stem; reject alternatives that change doppler, shift, waves 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.