1. The graph shows the US Department of Labor noise regulation for working witho
ID: 2138586 • Letter: 1
Question
1. The graph shows the US Department of Labor noise regulation for working without ear protection. A machinist is in an environment where the ambient sound level is of 85 dB, i.e., corresponding to the 8 Hours/day noise level. The machinist likes to listen to music, and plays a Boom Box at an average level of 84.0 dB.
A student at a rock concert has a seat close to the speaker system, where the average sound intensity corresponds to a sound level of 114 dB. By what factor does that sound intensity exceed the 1.5- Hours/day intensity limits from the graph?
Explanation / Answer
turn the dB levels in powers of 10. To do this simply divide the dB level by 10. 84 = 10^(8.4) 114 = 10^(11.4) 10log(10^(8.4) + 10^(11.4)) = 114.0043 dB 88.539 - 84 = 30.0043 dB
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