Overview of Cambridge International A Level Physics (9702)

The Cambridge International A Level Physics curriculum is designed to develop a deep understanding of physical models, mathematical problem-solving, and experimental skills. While it builds upon the foundation of the AS Level course, the A Level syllabus delves into highly advanced theoretical and applied physics concepts.

Foundation: AS Level Core

Success in A Level Physics requires mastery of the AS Level topics, which serve as assumed knowledge. These include: Physical quantities and units, Kinematics, Dynamics, Forces, density and pressure, Work, energy and power, Deformation of solids, Waves, Superposition, Electricity, D.C. circuits, and fundamental Particle physics.

Advanced A Level Subject Content

The A Level specific content explores complex mechanics, fields, thermodynamics, quantum phenomena, and modern real-world applications. The major topics are grouped below:

Advanced Mechanics and Thermal Physics

• Motion in a Circle: Kinematics of uniform circular motion, angular speed, and centripetal acceleration.
• Temperature & Ideal Gases: Thermal equilibrium, thermodynamic temperature scales, specific heat capacity, and specific latent heat. It also covers the mole, the ideal gas equation of state, and the kinetic theory of gases.
• Thermodynamics: Internal energy and the first law of thermodynamics, including calculations of work done by or on a gas.
• Oscillations: Simple harmonic motion (SHM), the interchange of kinetic and potential energy, damped and forced oscillations, and resonance.

Fields and Electromagnetism

• Gravitational Fields: Point masses, Newton's law of gravitation, gravitational field strength, gravitational potential, and planetary/satellite orbits.
• Electric Fields: Uniform electric fields, Coulomb's law for point charges, electric field strength, and electric potential energy.
• Capacitance: Capacitors in series and parallel, energy stored in a capacitor, and the mathematics of discharging a capacitor through a resistor.
• Magnetic Fields: Forces on current-carrying conductors and moving charges, the Hall effect, velocity selection, magnetic fields due to currents, and electromagnetic induction (Faraday's and Lenz's laws).
• Alternating Currents: Characteristics of alternating currents, root-mean-square (r.m.s.) values, rectification (half-wave and full-wave), and smoothing.

Quantum and Nuclear Physics

• Quantum Physics: The particulate nature of electromagnetic radiation (photons), the photoelectric effect, wave-particle duality (de Broglie wavelength), and discrete electron energy levels in atoms (line spectra).
• Nuclear Physics: The equivalence of mass and energy, mass defect, nuclear binding energy, nuclear fusion and fission, and the mathematical modeling of spontaneous and random radioactive decay (half-life and decay constants).

Applied and Modern Physics

• Medical Physics: The production and diagnostic use of ultrasound (piezo-electric transducers, acoustic impedance), the production and attenuation of X-rays (including CT scanning), and Positron Emission Tomography (PET scanning) using radioactive tracers and electron-positron annihilation.
• Astronomy and Cosmology: The use of standard candles to determine galactic distances, calculating stellar radii using Wien's displacement law and the Stefan-Boltzmann law, Hubble's law, redshift, and evidence for the expanding Universe and the Big Bang theory.

Practical Assessment and Skills

A central component of the A Level Physics qualification is the mastery of practical and investigative skills, which are assessed in two dedicated papers:

• Advanced Practical Skills (Paper 3): A laboratory-based exam testing manipulation of apparatus, measurement, observation, presentation of data, and evaluation of methods.
• Planning, Analysis and Evaluation (Paper 5): A written paper focusing on higher-order experimental skills. Students must design experimental investigations, analyze provided data (often using logarithmic graphs to find constants), evaluate uncertainties, and draw valid conclusions.

Exam Paper Structure

Candidates taking only the AS Level sit for Papers 1, 2, and 3. Those taking the full A Level sit for all five papers.