TYPES OF WAVES
Waves can be classified according to their broad physical properties; according to how the direction of motion of the particles is related to the direction of propagation of the wave; according to the number of dimensions in which they propagate energy and also according to how the particles of the medium move in time.
Imagine a stone is dropped in a still lake. Circular ripples spread out from the point where the stone entered the water. Along a given circular ripple, all points are in the same state of motion. These points define a surface called wavefront. If the medium is of uniform density, the direction of motion of the wave is at right angles to the wavefront. A line normal to the wavefront, indicating the direction of motion ...
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