Exam-style question
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Evaluate a student answer to Describe Doppler Shift For Waves From Moving Sources: what must be included for full A-Level credit?.
Model answer
What a good answer should say
- Source Link response f65121: state Describe Doppler shift for waves from moving sources., apply phase difference, path difference, stationary wave, progressive wave, diffraction, and finish with the physical consequence for Cosmology.
Explanation
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Stem being answered: Evaluate a student answer to Describe Doppler Shift For Waves From Moving Sources: what must be included for full A-Level credit? Route focus: astrophysics / Cosmology.
Key vocabulary for this item: doppler, shift, waves, moving, sources. 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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