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This comprehensive Pearson Edexcel IAL Physics Unit 2 (WPH12/01) Master Revision Guide covers Waves and Electricity in full. Aligned with the 2019–2025 exam series and based on Principal Examiner Reports (2019–2024).

What’s inside?

Priority heatmap – Critical topics appear nearly every sitting: Young’s double slit (λ = ax/D), diffraction grating (nλ = d sinθ), stationary waves (nodes/antinodes, λ/2 spacing), EMF and internal resistance (V = ε – Ir, V-I graph gradient = –r), series/parallel circuits, resistivity (ρ = RA/L), I-V characteristics (ohmic, lamp, diode), and potential dividers (thermistor/LDR).

Top 15 penalised errors – Confusing λ with x in Young’s slit, not converting lines/mm to d (m), forgetting sinθ ≤ 1 for max order, missing one TIR condition (denser→less dense AND angle ≥ C), confusing EMF with terminal pd, and nodes/antinodes swapped.

Core practicals (CP4–CP7) – CP4 (stationary waves on string, λ = 2× node spacing, f = nv/2L), CP5 (wavelength of light – Young’s slit or diffraction grating), CP6 (resistivity – R vs L graph, gradient = ρ/A, largest uncertainty in diameter), CP7 (I-V characteristics – potential divider method).

Maths skills – Worked examples for diffraction grating (max order), EMF graph analysis (ε from y-intercept, r from gradient), Young’s slit calculation, and potential divider with thermistor.

Model answers – 1-mark to 6-mark extended writing, including coherent sources (same frequency + constant phase difference) and TIR conditions.

Exam predictions – High-confidence: Young’s slit/diffraction grating (4–6 marks), EMF/internal resistance (graph analysis), series/parallel circuits (Kirchhoff’s laws), I-V characteristics (shape explanation), and stationary waves (diagram + calculation).

Teacher tools – Diagnostic activities (I-V graph sketch, TIR conditions, lines/mm calculation), common misconceptions register (adjacent nodes = λ/2, not λ), differentiated revision (support/core/stretch), and classroom starters/exit tickets.

Independently produced by Samata Reviews. Not affiliated with or endorsed by Pearson Education Limited or Edexcel.

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