# waves and sounds

Jun 17th, 2015
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WAVES- A method of energy transfer involving some form of vibration is called waves.For instance, the waves on the surface of the liquid or along a strong stretched involve regular to and fro motion of particulars around a mean position.

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-1WAVESA method of energy transfer involving some form of vibration is called waves.For instance, the waves on the surface of the liquid or along a strong stretchedinvolve regular to and fro motion of particulars around a mean position.EXAMPLE 1EXAMPLES OF WAVES IN OUR DAILY LIFE:-Often children playing near a pond drop a pebble or stone into the pond water toproduce circular shaped repels on the surface of calm or still water.EXAMPLE -2The children amuse themselves when they give continuous jerk to a rope and tryto make a snake like shape.Oscillation Motion (Vibration) :Def. # 1:-Any regular repeated to and fro motion or change is called vibratory or oscillatorymotion.Def. # 2:-If body is in periodic motion moves back and forth over a same path this motionis called oscillation or vibration.COMMON EXAMPLE OF VIBRATORY MOTION:-1.2.3.4.The swinging bob of pendulum.Balance wheel of a watch.A violin string.Any mass attached to the spring.MASS ATTACHED TO THE SPRING:-Vibration closely related to elasticity of body. The phenomenon of elasticity isclosely linked with that of vibration or oscillation.-2It is the common experience that when some elastic material for example:a mass attached to one end of spring and placed on a frictionless horizontal surface asshown in figure, if it is displaced from its normal and equilibrium position and thenreleased it will move through the equilibrium position and become extended in theopp

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