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Sound=The energy which is produced by rapid to and fro movement is called Sound
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Sound is a vibration that propagates as a typically audible mechanical wave of pressure and displacement, through a medium such as air or water. Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate. Vibrations in air are called traveling longitudinal waves, which we can hear. Sound waves consist of areas of high and low pressure called compressions and rarefactions, respectively.

I hope this explanation is enough and helpful for you........Be happy............

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