Wave motion

 INTRODUCTION ON WAVE

When we throw a stone in a quiet pond, nice circular ripples emerge surface of water that move in a concentric pattern outward from the point of disturbance. This repository waves are from precisely surface wave. Though the spreading patterns of the surface waves nice and simple, the physics behind it is quite complex.

Actually the stone displaces the water molecules at the point of impact from their equilibrium position. These molecules execute a back and forth by vibration and in doing so, all the neighboring molecules throughout the surface are forced to do the same about their mean positions. So a kind of disturbances seem to propagate from the point of impact in radially outward direction. This is disturbance travelling from one point to another point is called a wave motion. During a wave motion the particle though displaced from their mean position, do not actually travel from one point to another. Rather they transfer the energies to neighboring molecules during the vibration and it is the energy that is being transported from one point to another. Thus, we can say that Wave Motion is a mode of energy transfer from one point to another point. 

as an analogy, following example is relevant to understand the Wave Motion when a  person is standing at last of a Very long queue push another  person in front of him, He loses balance and all the other person ahead in the queue the receive  gentle push and hence  lose balance to some extent. However all of them in the line manage to return back to the initial position therefore the disturbance is in the form of push created at the end of queue travelled throughout the queue to the front. But there is no actual displacement of the person in the queue from end to front. This is the real way of wave motion in a material medium. On contrary a running stream of water carries energy with itself as it moves along. This is not the way of energy transfer in discussion for our present situation.