The graph shows the US Department of Labor noise regulation for working without

Question

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 88.0 dB.

1. Calculate the INCREASE in the sound level from the ambient work environment level (in dB).
4.76

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 118 dB. By what factor does that sound intensity exceed the 1.5- Hours/day intensity limits from the graph? HELP??

Explanation / Answer

. Convert 88 dB and 85 dB to intensities. Add them. Convert back to dB and compare to the original 85 dB level.

doing that we get 89.764

so to get the increment=89.764-85=4.764 dB

2.

b) 1.5 hours/day sound level is 97 dB (0.005012 W/m

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