both questions
3. 1 pts) The following noise record was obtained from a small shopping mall...
3. 1 pts) The following noise record was obtained from a small shopping mall in Tallahassee, Florida Determine the equivalent continuous equal energy level (Leel. Sound level (dBA) Time (h) 0000-0600 0600 -0800 0800-1000 1000 - 2000 2000-2200 2200 - 0000 (20 pts) Two oil-fired boilers for a 600 megawatt (MW) power plant produce a sound power level of 149 dB (re 10- W) at 4,000 Hz, from the induced draft fans. Determine the sound pressure level 4080 m downwind on a clear winter night when the wind speed is 4.50 m/s, the temperature is 10.0°C, the relative humidity is 30 percent, and the barometer pressure is 101.3 kPa. The height of the boileris 12 m. The height of the receiver is 1.5 m. The ground surface characteristics are shown below. MacBook Air