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.

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

Compute the intensities from the levels, add them to get the total intensity, then find the total sound level. Note the question asks for the increase.

Explanation / Answer

1. Convert 85 dB and 84 dB to intensities. Add them. Convert back to dB and compare to the original 85 dB level. 2. Find out what dB level corresponds to 1.5 hours per day. How many more dB is 118 dB than that? Convert that relative amount in dB to a factor, 10^(dB/10).

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