Executive Series Overview

The October/November 2024 Physics (9702) series delivered a classically structured assessment that rewarded candidates with systematic preparation. While Paper 21 (AS Level Structured) was relatively straightforward and accessible, Paper 41 (A Level Structured) posed significant analytical hurdles in topics such as simple harmonic motion graphing, gravitational orbits, and electromagnetic induction. Papers 31 and 51 maintained high standards of experimental physics, testing mathematical modeling, error propagation, and linear graphical analysis.

Where the Marks Were Won & Lost

In the theory papers (Paper 21 and 41), high-scoring candidates demonstrated exceptional competency in standard derivations, such as showing the relationship between period and orbital height: \((h + B)^3 = \frac{GA}{4\pi^2} T^2\). Conversely, many candidates dropped marks on qualitative explanations. A common area of difficulty was explaining why total potential and electric field strength cannot simultaneously be zero between two charged spheres, as well as describing the precise mechanism of positron-electron annihilation in PET imaging.

Pitfalls & Examiner Concerns

  • Unit Conversion Errors: Many candidates failed to convert minutes to seconds during power calculations, or neglected prefix multipliers (such as \(\mu\text{A}\) or \(\text{k}\Omega\)) when reading graphs.
  • Sloppy Graph Sketching: In Simple Harmonic Motion and photoelectric effect questions, sketches often missed key boundary conditions. For instance, the \(h\) vs \(t\) plot required precise peaks at \(9.5\text{ cm}\) and troughs at \(3.5\text{ cm}\).
  • Sig-Fig Rigour: Practical papers showed candidates still struggle with consistency, particularly with giving the correct number of significant figures in calculated constants \(k\) matching the input variables \(T\) and \(d\).

Preparation Strategy & Outlook

Candidates preparing for the next series should prioritize mastering field equations (both gravitational and electrical) and practicing multi-step calculations in thermodynamics. Mastery of SI units, base-unit derivations, and absolute/percentage uncertainty calculation remains non-negotiable for scoring highly in the initial questions of both Paper 2 and Paper 5.