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Ch 16 Wave Motion A wave is a perturbance/disturbance that travels(propagates) in space/time. Examples: waves on a string, sound waves, EM waves, water waves Classification of Waves (i) By their nature: (a) Mechanical waves, which need 'particles' to oscillate, need a medium to propagate in; e.g., water, string, sound waves. (b) Non-mechanical waves, which do not need particle medium; e.g., EM waves, like light can travel in vacuum. (ii) by their propagation Ch18 Superposition of Waves