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Sound waves are mechanical in nature. It means that it needs a material medium so essentially. As sound waves pass through the medium, the material does simple harmonic motion. Hence the energy is related to the amplitude of vibration. Energy is directly proportional to the square of the amplitude. Energy passing through the medium is derived in a formula as 2 pi2 m a2 f2. m- mass of the particle of the medium

a-amplitude of vibration and f - the frequency of vibration.

So the intensity is the term used to mean the energy of sound waves. It is defined as the energy per unit area crossing in one second.

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15y ago

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