THE SCIENCE AND APPLICATIONS OF ACOUSTICS - H. H. Arnold ...

2. Find the PSIL from the following octave-band noise spectrum.Problems for Chapter 10 241Center FrequencyBackground Noise Level, dB500 551000 632000 723. Find the PSIL from the following octave-band noise spectrum:Center frequency, Hz 63 125 250 500 1k 2k 4k 8kBand-pressure level, dB 52 56 57 62 55 51 50 454. Determine the voice level necessary to effectively communicate of a distanceof 4 ft with a background of(a) 63 dB(b) 72 dB(c) 85 dB5. Why does the U.S. Occupational Safety and Health Administration prohibitimpact noises of 130 dB or more even if the overall sound pressure level is lessthan 90 dB during the course of an 8-h day?6. Express 35 dB I terms of pressure in pascals and in terms of intensity (W/cm 2 ).At 62.5 Hz, is this considered audible for normal hearing? If so, how muchabove the MAP is the sound pressure level?7. How loudly must one speak, in terms of decibels, with a white noise backgroundof 50 dB in order to be understood? How loud must the speech be in order tobe detected, if not necessarily understood?8. At 500 Hz, a 40-dB tone sounds as equally loud as a 5-kHz tone. What is thedB level of that 5 kHz tone?