Structure of materials

Waves and interference

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We are all familiar with water waves. And most people have seen how squash balls bounce back from a wall. What do these two phenomena have to do with each other? In the double-slit experiment we'll have a look at the quantum world and see that light sometimes behaves like water waves and sometimes like little spheres. The story is told that even Niels Bohr sometime got dizzy when thinking about these dual characteristics of light.