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How is sound produced ?

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Sound waves are mechanical waves; they are produced when something vibrates. The vibrating body causes the medium around it also to vibrate, producing what are known as 'longitudinal waves' which we hear as sound. In longitudinal waves, the motion of the individual particles of the medium (like air molecules in air) is in a direction that is parallel to the direction of energy transport. Sound waves consist of areas of high and low pressure called compressions and rarefactions, respectively. Sound waves of speech, music, and tremors, fireworks and so on, that reaches us through the atmospheric air are examples of longitudinal waves.


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