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Diffraction Between Wax Blocks
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In this optics activity, learners explore diffraction by adding wax blocks to a ripple tank. The wedge-shaped blocks act as obstacles that the wave must bend around.

Rutherford's Enlarged: A Content-Embedded Activity to Teach about Nature of Science
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This paper describes a working-model demonstration of Ernest Rutherford's 1911 experiment about the nature of atoms.
Interference in a Ripple Tank
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In this optics activity, learners explore interference by adding wax blocks to a ripple tank.