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Waves 1) Particles of the medium vibrate simple harmonically about their mean position. 2) Particles do not leave their mean position and the medium is not transported along with the wave. 3) With the wave, energy and momentum are transferred to the neighboring particles of the medium. 4) In a homogeneous medium,  velocity  of waves in all times is same. However, as particles are in SHM, their velocities at different positions/times are different. 5) There is a continuous phase difference amongst successive particles of the medium. Waves Classification of waves 1) On the basis of necessity of material medium  a) Mechanical waves or elastic waves like sound waves, waves on the surface of water, waves on strings. All these waves require a material medium for propagation. b) Electronic waves like light waves, radio waves which require no medium for propagation. Classification of waves 2) On the basis of vibration of particles a) Longitudinal wave...