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 82.0 dB.

Calculate the INCREASE in the sound level from the ambient work environment level (in 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 118 dB. By what factor does that sound intensity exceed the 1.5- Hours/day intensity limits from the graph?

Explanation / Answer

  a) Adding a sound level of 85 dB and a sound level of 82 db gives a total level of 85.54 dB.

b) 1.5 hours/day sound level is 97 dB (0.005012 W/m²).
Rock concert sound level is 118 dB (0.630957 W/m²).

ratio = 0.630957 / 0.005012 = 125.889

The factor that exceed the 1.5 hours/day limits is 125.889.

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