Standing waves.

A seesaw to visualize how standing waves move in an enclosed basin.

In enclosed basins, standing waves can occur. In the simplest case, they have a node in the middle and the largest amplitudes at the edges of the basin. The movement of the water’s surface then closely resembles that of a seesaw.

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A seesaw. Largest amplitudes at the ends, node in the middle.

Extremely simple but extremely effective visualization!

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