Difficulty Verdict
The May/June 2024 papers for Unit 1 (WPH11) and Unit 2 (WPH12) presented a balanced yet demanding challenge for AS Level candidates. While Section A multiple-choice questions provided accessible marks on core definitions, Section B required a deep mathematical rigor and highly structured qualitative reasoning. Multi-step calculations and algebraic derivations dominated, punishing students who relied on superficial formula memorisation without conceptual understanding.
Where the Marks Are Won or Lost
High-value marks were heavily concentrated in mechanics and wave phenomena. In WPH11, the projectile analysis (Question 17), the bridge moments calculation (Question 18), and the multi-force zip-line vector analysis (Question 19) accounted for more than a third of the paper's total weight. In WPH12, the 14-mark heating panel resistivity/power problem (Question 14) and the photoelectric effect and de Broglie calculations (Question 17) tested both algebraic substitution and units conversion. Students who excelled at maintaining clear, intermediate steps and converting micro/milli prefixes systematically secured the highest marks.
Examiner Pitfalls & Mistakes
- Unit Conversions: A persistent source of dropped marks was the failure to convert areas (e.g., \( mm^2 \) to \( m^2 \)) and prefixes (e.g., milliseconds to seconds in waves, or millimetres to metres in wire diameters).
- Echo Round-Trips: In the fishing boat pulse-echo question, many candidates forgot to halve the total travel time or distance, a classic examiner trap.
- Moments & Forces: When taking moments on the bridge question, a significant portion of candidates omitted the distance multiplier or incorrectly resolved angled components using \( \sin \) instead of \( \cos \).
- Show That Verification: On "show that" questions, students often skipped showing the exact, unrounded intermediate calculation steps, which is an automatic marker deduction.
Preparation Strategy
To master future series, candidates must focus heavily on structured algebraic practice and physical mechanics. Always start your calculations by writing the base formula, listing the variables with their SI units, and rearranging the equation algebraically before substituting values. Dedicate study time to practicing six-mark QWC (Quality of Written Communication) questions by writing bullet-pointed, logical experimental procedures, emphasizing which instruments are used (e.g., micrometers for wire diameters) and how the final constant (like the Young Modulus) is extracted from a graph's gradient.
Future Paper Predictions
Given the strong emphasis on practical setups and graphical slopes in this series, future papers are highly likely to test the derivation of internal resistance using \( V = \mathcal{E} - Ir \) graphs, and the wave particle duality using LED activation voltage experiments. Ensure you are fully prepared for unexpected experimental contexts that test the application of Stokes' Law and upthrust in non-standard fluid dynamics.