A-LevelPhysicsWavesFeb/Mar 2022Paper 1 Q231 Mark
Brief pulses of red, blue and green light are emitted from the Sun at the same time. The pulses travel the same distance to reach Mars. Assume that the pulses travel in a vacuum for the full duration of their journey. In which order would these pulses of light arrive at Mars?
Aall arrive at the same time
Bblue first, then green, then red
Cred first, then blue, then green
Dred first, then green, then blue
✓ Correct Answer
The correct answer is A: all arrive at the same time
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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