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Wave-particle duality (A-level only)

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Question 16
part 1.

In a transmission electron microscope (TEM), magnetic lenses are used to focus the electron beam. Which of the following best describes the function of the condenser lens?

  • A. It accelerates the electrons from the cathode to high speeds.
  • B. It deflects the divergent electron beam into a parallel beam to uniformly illuminate the thin specimen.
  • C. It forms the first magnified image of the specimen.
  • D. It projects the final magnified image onto a fluorescent screen or detector.
[1]
part 2.

The electrons in a particular TEM have a kinetic energy of 1.6 × 10-16 J. Relativistic effects are negligible at this energy.

Suggest, with a calculation, whether the images of individual atoms (typical diameter of 0.1 nm0.1\text{ nm}0.1 nm) can, in principle, be resolved in this TEM.

[4]
Markscheme

Wave-particle duality (A-level only) Questions

  1. A Level
  2. /Physics
  3. /Wave-particle duality (A-level only)

26 exam-style questions on AQA A Level Physics Wave-particle duality (A-level only), covering Newton's corpuscular theory of light (A-level only), Significance of Young's double slits experiment (A-level only), Electromagnetic waves (A-level only), The discovery of photoelectricity (A-level only), Wave-particle duality (A-level only), and Electron microscopes (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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