b) An auditorium has dimensions of 15.00 m x 12.00 m x 4.00 m high. The walls are 3/8- inch plywood paneling, the floor is covered with indoor-outdoor carpet on the concrete slab, and the ceiling is 3/4-inch perforated ceiling tile on a furring backing. There are 10 windows of ordinary glass, each 1.75 m x 1.00 m, and the windows are closed. There are no draperies on the windows. When the auditorium is in use, there are 100 people seated in the wood theater chairs. A ventilating fan (directivity factor, Q=2) located in the room has a sound power level of 72 dB in the 500 Hz octave band. Determine the steady-state sound pressure level in the 500 Hz octave band at a distance of 8.00 m from the fan for the following conditions: [Satu auditorium mempunyai dimensi 15.00 m x 12.00 m x 4.00 m tinggi. Dinding 3/8-inci panel papan lapis, lantai ditutup dengan permaidani dalaman-luaran pada papak konkrit, dan siling adalah 3/4-inci jubin siling berlubang pada sokongan pelapik Terdapat 10 tingkap kaca biasa, setiap 1.75