Discuss how ripples are formed in still water.

Explanation

Suppose the 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 strike the { boundary of the trough. This is because some of the kinetic energy of the stone is transmitted to the v,after molecules on the surface. Actually the particles of the water (medium) themselves do not moYe outward ,Yith the disturbance. This can be obsen-ed by keeping a paper strip on the water surface. The strip moves up and down , then the disturbance (wave) passes on the water surface. This shows that the water molecules only undergo vibratory motion about their mean positions.