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Sound Intensity is sound power per unit area and it is also known as acoustic intensity.In physics Basic unit used to define it is  watt/m^2
Reverberation is collection of reflected sounds in an enclosure like an auditorium.

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Sound intensity is defined as sound power per unit area .the usual context is the measurement of sound in air at a listener location. the basic units are watts/m² or watts/cm².
Reverberation is the collection of reflected sounds from the surface  enclosure like an auditorium .
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