Shown below are concentric solid and dashed circles, each different in radius by 1 cm. Consider the circular pattern a top view of water waves, where the solid circles are crests and the dashed circles are troughs.
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On a sheet of paper, draw two sets of concentric circles with a compass. Choose any part of the paper for your center (except the present central point). Let the circles run off the edge of the paper. (optional diagram)
- Find where a dashed line crosses a solid line and draw a large dot at the intersection. Do this for ALL places where a solid and dashed line intersect.
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With a wide felt marker, connect the dots with smooth lines. These nodal lines lie in regions where the waves have cancelled - where the crest of one wave overlaps the trough of another.
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