Electron diffraction

Overview

Recall questions on the experimental evidence for electron diffraction through a thin slice of polycrystalline graphite.

What you need to know

Answer each one before you reveal it.

Questions from this subtopic

Each one with the model answer underneath.

1. 1

   What is electron diffraction?

   Model answer

   Electron diffraction is the phenomenon where electrons exhibit wave-like behaviour by producing diffraction patterns when passing through narrow gaps or around obstacles.

2. 2

   In the electron diffraction experiment using graphite, how are the electrons prepared before reaching the target?

   Model answer

   Electrons are accelerated through a potential difference.

3. 3

   What material do electrons pass through in the standard electron diffraction demonstration?

   Model answer

   Electrons pass through thin polycrystalline graphite.

4. 4

   Describe the pattern observed on the fluorescent screen when electrons are diffracted by graphite.

   Model answer

   Concentric circular rings appear on the fluorescent screen.

5. 5

   What does the ring pattern in electron diffraction indicate about the behaviour of electrons?

   Model answer

   The ring pattern indicates constructive interference occurring at specific angles, demonstrating wave-like behaviour.

6. 6

   What fundamental property of matter does electron diffraction provide evidence for?

   Model answer

   Electron diffraction provides evidence that particles exhibit wave-like behaviour.

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