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Question
Discuss how ripples are formed in still water.
Solution
- Suppose we drop a stone in a trough of still water, we can see a disturbance produced at the place where the stone strikes the water surface.
- We find that this disturbance spreads out (diverges out) in the form of concentric circles of ever-increasing radii (ripples) and strikes the boundary of the trough.
- This is because some of the kinetic energy of the stone is transmitted to the water molecules on the surface.
- Actually, the particles of the water (medium) themselves do not move outward with the disturbance.
- This can be observed by keeping a paper strip on the water surface. The strip moves up and down when the disturbance (wave) passes on the water surface.
- This shows that the water molecules only undergo vibratory motion about their mean positions.
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