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Sound is a longitudinal mechanical wave sound has great importance in our daily life.It gives us a sensation of hearing.It makes possible to communicate with other persons through speech Example-sound energy is produced when an object vibrates.
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Sound is produced when an object vibrates. These sound vibrations causes waves of pressure that travel  through a medium such as air, water, etc. Sound energy is a form of mechanical energy. some examples of sound are an electric guitar whining, screaming, hen cackling, thunder, etc.
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