O-LevelPhysicsThermal Physics5054/12 · Oct/Nov 2025 · Q251 Mark

Four copper spheres have identical surface colours and identical surface textures. They have different surface temperatures and surface areas. Which sphere emits infrared radiation at the greatest rate? [Table 25.1]

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Asurface temperature/°C: 500, surface area /cm²: 120

Bsurface temperature/°C: 500, surface area /cm²: 480

Csurface temperature/°C: 1000, surface area /cm²: 120

Dsurface temperature/°C: 1000, surface area /cm²: 480

✓ Correct answer

D: surface temperature/°C: 1000, surface area /cm²: 480

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Topic: Thermal Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2025 Paper 1 Variant 2, question 25.

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