What is amplitude

The maximum height reached by a trough or crest of a sound wave is called amplitude.

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The maximum height attained by the particles in a wave is called amplitude.
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 Amplitude is used to describe the peak value of such quantities as the level of sound waves, and power and voltage in electrical and electronic system. 
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In simple words, 
                           Amplitude is defined as the maximum displacement of the particles from their original position.
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