2025 · Paper 1 · Physics
Question 10
The printed question, the official key, and each model’s JSON answer plus the reasoning it wrote.
PhysicsPaper 1Numerical
Q10
Official 3
Model answers
Claude Fable 5.1
Anthropic
Correct4 / 4
3
Claude Fable 5.1 reasoning
Classic radiation shield problem. Fig. 1: W₀ = σ(T_P⁴ − T_Q⁴). Fig. 2: Two intermediate black plates at steady-state temperatures T₁ and T₂. Heat flows only between adjacent plates, and in steady state the same power per unit area W_S passes through each gap: W_S = σ(T_P⁴ − T₁⁴) = σ(T₁⁴ − T₂⁴) = σ(T₂⁴ − T_Q⁴) Adding the three equations: 3W_S = σ(T_P⁴ − T_Q⁴) = W₀. Hence W₀/W_S = 3.
GPT 6 Astra
OpenAI
Correct4 / 4
3
GPT 6 Astra reasoning
No written reasoning was returned for this item.
GPT 5.6 Luna
OpenAI
Correct4 / 4
3
GPT 5.6 Luna reasoning
No written reasoning was returned for this item.