Coverage and evidence · 13 September 2026
What this pilot covers
Ten short lessons, focused attempts, combined exam practice and a final set where you choose the method. Shared SL and HL content; first assessment 2025.
| Learning unit | Local syllabus references | Authentic source used | Original items |
|---|---|---|---|
| The solar constant | B2.U5 | 2025 May HL Paper 2 · Q8 (a) | 3 |
| Radiation across a planet | B2.U6 | 2011 May HL Paper 2 · QB4 (1.a) | 3 |
| Albedo | B2.U3 | 2024 November HL Paper 1 · Q25 (whole) | 3 |
| Changing albedo | B2.U4 | 2025 May SL Paper 1A · Q9 (whole) | 3 |
| Emissivity | B2.U2, B1.radiation | 2025 November HL Paper 1A · Q11 (whole) | 3 |
| Greenhouse gases | B2.U7 | 2013 November HL Paper 2 · Q8 (a.i) | 3 |
| Absorption and emission | B2.U8, B2.U9 | 2025 May HL Paper 2 · Q8 (b.i) | 3 |
| Enhanced greenhouse effect | B2.U10, B2.U1 | 2025 May HL Paper 1A · Q11 (whole) | 3 |
| Equilibrium temperature | B2.U1, B2.U2, B2.U3, B2.U6, B2.guidance.equilibrium | 2014 May HL Paper 2 · Q6 (1.e) | 3 |
| Surface–atmosphere balance | B2.U1, B2.guidance.balance | 2025 May HL Paper 2 · Q8 (b.iii) | 3 |
Syllabus check
The IB-authored guide, updated November 2024, was checked at printed pages 40–41 and 79–81. Its listed amendments do not change B.2. Local U1–U10 references follow the order of its understanding bullets. Later member-only notices could not be checked.
Audit scope
169 tagged entries plus 16 additional candidates were reviewed at part level. 58 candidate entries had no selected B.2 demand. Unrelated parts and legacy extensions are recorded separately. The 104 incompletely parsed papers remain a gap, so this is not a claim of complete archive coverage.
11 unique authentic parts support the pilot. Every displayed source image and its matching answer was checked. Original variants fill the additional focused practice, with adaptations labelled. The final questions use separately reserved families and make no claim to predict a future examination.
How marking works
Numerical and multiple-choice answers are checked automatically. A correct number does not earn reasoning marks. Written answers use an explained model and a checklist for self-marking. No student accounts, live AI grading or lasting learner records are used.
Teaching and exam practice
The explanation teaches the physics first, with terms explained in context. A separate Exam focus box then connects that understanding to definitions, calculations and written answers. The source excerpts keep their original wording.
Scientific diagrams
Each of the 19 diagrams has been checked against the idea it explains, including ray paths, angles, areas, quantities and labels. Full-size links support closer inspection on small screens. Captions distinguish schematic energy flows from quantitative comparisons and state the assumptions of each model.
Presentation and preserved narration
The current lessons use study notes and static diagrams. Narration and animation work is preserved for a later review stage; no playback is required.
Scripts, file hashes, durations and word boundaries are checked. Local speech recognition provides an additional check of the produced audio. Human listening approval of every segment is not claimed; the written explanation remains available throughout.
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