Rings are shown with an electron diffraction tube.
Wave-particle duality. The electron beam behaves like waves, showing interference.
NCEA & Science Curriculum
Turn on and wait. Note that the rings are dim and are not visible with the room lights on. In a large lecture theatre a video camera can be used to display the rings using a data projector.
Electron diffraction setups come in a variety of forms. Note that they will typically use high voltages to accelerate electrons. The one shown here is enclosed but not all are.
Individual teachers are responsible for safety in their own classes. Even familiar demonstrations should be practised and safety-checked by individual teachers before they are used in a classroom.
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