Tamil Nadu Board of Secondary EducationHSC Science Class 11

Discuss how ripples are formed in still water. - Physics

Answer in Brief

Discuss how ripples are formed in still water.



  1. 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.
  2. 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.
  3. This is because some of the kinetic energy of the stone is transmitted to the water molecules on the surface.
  4. Actually, the particles of the water (medium) themselves do not move outward with the disturbance.
  5. 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.
  6. This shows that the water molecules only undergo vibratory motion about their mean positions.
Concept: Introduction to Waves
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Chapter 11: Waves - Evaluation [Page 277]



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