A room has dimensions 5.5 m (width) 7 m (length) 3.5 m (height). The walls consist of

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A room has dimensions 5.5 m (width) 7 m (length) 3.5 m (height). The walls consist of gypsum wallboard, the ceiling has suspended acoustic tile, and the floor is covered with vinyl tile on concrete. There are two large glass windows on the wall, each measuring 2 m 1.5 m. Calculate the total absorption of this room at 1000 Hz. We then remove the tile and install heavy carpet, and hang three paintings on the wall, each with absorption coefficient 0.35 (at 1000 Hz), one measuring 0.8 m 0.4 m, and the other two measuring 1 m 1.4 m. what is the noise reduction we have achieved with this modification