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IB Physics HL B 1 12 Conduction Rate Questions

Practise HL conduction-rate questions on gradients, ice layers, walls and thickness changes using thermal data in quantitative exam questions.

Syllabus
First assessment 2025
Course
Physics HL
Level
HL

Exam points

  • Apply ΔQ/Δt = kAΔT/Δx to relate conduction rate to conductivity, area, temperature gradient and thickness.
  • Calculate or compare conduction rates using consistent units and complete mark-scheme evidence.

IB Physics HL B 1 12 Conduction Rate Questions question 1

[Maximum number: 2]
Figure for Question IB Physics HL B 1 12 Conduction Rate Questions question 1 — IB Physics HL

The following data are available:

 Thickness of wall =0.25 m Area of wall =18 m2 Thermal conductivity of wall =1.3Wm−1 K−1 Constant room temperature =22∘C Constant outside temperature =13∘C\begin{aligned} \text { Thickness of wall } & =0.25 \mathrm{~m} \\ \text { Area of wall } & =18 \mathrm{~m}^{2} \\ \text { Thermal conductivity of wall } & =1.3 \mathrm{Wm}^{-1} \mathrm{~K}^{-1} \\ \text { Constant room temperature } & =22^{\circ} \mathrm{C} \\ \text { Constant outside temperature } & =13^{\circ} \mathrm{C} \end{aligned}

Estimate the rate at which thermal energy leaves the room through the wall giving the answer with an appropriate unit.

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