You have a room that is 4 m long, 7 m wide, and has a ceiling height of 3 m.

The floor is hardwood, α= .15 at 500 Hz. The walls are gypsum wallboard (GWB), α= .30 at 500 Hz. The ceiling is acoustic ceiling tile (ACT), 

α = .95 at 500 Hz.

1. 
   

2. What is the room constant for this room?

3. For a person speaking, what is the critical distance in this room? Use Q = 2.

4. If a person speaking produces a sound power level of 70 dB, how much sound pressure level would you expect at a distance of 3 m?

5. Is this in the direct field or the reverberant field?

6.