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IB Physics HL E 2 4 Hl Particle Diffraction Questions

Use HL electron-diffraction evidence to show matter waves, interpreting Davisson–Germer scattering and wave–particle duality.

Syllabus
First assessment 2025
Course
Physics HL
Level
HL

Exam points

  • explain how electron diffraction by a crystal provides evidence for the wave nature of electrons and supports the de Broglie hypothesis
  • identify the Davisson–Germer result and distinguish electron diffraction from photoelectric, nuclear-scattering and other quantum evidence
  • compare particle-like and wave-like observations of electrons to describe matter-wave duality

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Study E.2.4 (HL)—Particle diffraction conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Physics HL E 2 4 Hl Particle Diffraction Questions question 1

[Maximum number: 3]

This question is in two parts. Part 1 is about thermal properties of matter. Part 2 is about quantum physics.

Part 1 Thermal properties of matter

Part 2 Quantum physics

The diagram shows the end of an electron diffraction tube.

Figure for Question IB Physics HL E 2 4 Hl Particle Diffraction Questions question 1 — IB Physics HL

A pattern forms when diffracted electrons are incident on a fluorescent layer at the end of the tube.

Explain how the pattern demonstrates that electrons have wave properties.

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