We all know how waves are formed by a pebble thrown into a still pond. The ripples move in ever growing circles. Likewise, waves propagate along a rope when we shake it from one end. The propagation of any change, vibration or perturbation in a medium is called a wave. There is a broad range of wave motions in our everyday life and in nature: Sound waves, water waves, electromagnetic waves that form light and radio-TV signals, etc.
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