O-LevelPhysicsThermal PhysicsOct/Nov 2025Paper 1 Q241 Mark
Energy can be transferred by thermal radiation. Four surfaces have different colours and textures. The surfaces are at equal temperatures and have equal surface areas. Which surface transfers energy by thermal radiation at the fastest rate?
Ablack and dull surface
Bblack and shiny surface
Cwhite and dull surface
Dwhite and shiny surface
✓ Correct Answer
The correct answer is A: black and dull surface
📋 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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