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Physics HL

Chapter 22: Quantum Physics

Build Chapter 22 from photon energy and photoelectric evidence to Compton scattering, matter-wave reasoning, and electron diffraction as direct support for wave-particle duality.

Estimated chapter time: 214 minutes

Chapter Topics

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  1. 1How to Read This Quantum Physics Chapter
    1. 1.1Why Chapter 22 Feels Different
    2. 1.2Learning Targets
    3. 1.3Recommended Problem-Solving Workflow
  2. 222.1 Photons, Energy Quantisation, and the Photoelectric Start
    1. 2.1From Wave Frequency to Photon Energy
    2. 2.2Photon Momentum and Radiation Pressure
    3. 2.3Why This Matters Before Photoelectric Details
  3. 322.2 Photoelectric Effect Evidence and Einstein's Equation
    1. 3.1Experimental Setup and Stopping Voltage Meaning
    2. 3.2Einstein Model: One Photon, One Electron Event
    3. 3.3Common Exam Pitfalls
  4. 422.3 Compton Scattering and Photon Momentum Evidence
    1. 4.1Collision Picture and Why Wavelength Increases
    2. 4.2Compton Shift Equation
    3. 4.3Energy Transfer Interpretation
  5. 522.4 de Broglie Hypothesis and Matter-Wave Scaling
    1. 5.1From Photon Duality to Matter Duality
    2. 5.2Accelerating Voltage to Electron Wavelength
    3. 5.3What the Wave Represents
  6. 622.5 Electron Diffraction, Bragg Geometry, and Quantised Orbits
    1. 6.1Davisson-Germer as Direct Matter-Wave Evidence
    2. 6.2Bragg Condition for Constructive Interference
    3. 6.3Connection to Bohr Orbit Quantisation
  7. 7Chapter 22 Wrap-Up
    1. 7.1One Workflow for Quantum-Evidence Problems

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