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The _______ of a sound wave is defined as the amount of energy passing through a unit area of the wave front in a unit of time.

A. intensity
B. frequency
C. amplitude
D. compression

User Djs
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The correct answer is sound intensity: answer A.

Sound intensity is the amount of energy that passes through certain area, and it is measured in watt (the energy) by square meters (the area) : W/m².

It's also known under another name, acoustic intensity.
User Diadyne
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