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

Question

The graph shows the US Department of Labor noise requlation 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 0 85 90 95 100 105 Calculate the INCREASE in the sound level from the ambient work environment level (in dB). Sound Level (dB) 86.76 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. Submit Answer Incorrect. Tries 2/20 Previous Tries 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 2- Hours/day intensity limits from the graph dstudent at ta rock conscent has seat close to hespeeker ystern where tht verage sound intensity corresponds to a sound level of 114 Submit Answer Tries 0/20

Explanation / Answer

a. The increase in the sound level = 85-82 dB = 3dB

b. The 2 hour /day intensity level =85 dB

So increase in sound level = 114 -85 = 29 dB

If F= factor by which sound intensity exceeds

then 29 = 10 log F

so, 2.9 = log F

so, F = 102.9 = 794.32

all the best in the course work

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