*I only need help with part B please* OSHA, the Occupational Safety and Health A
ID: 1463228 • Letter: #
Question
*I only need help with part B please*
OSHA, the Occupational Safety and Health Administration, has established shandards for workplace exposure to noise. According to OSHA's Hearing Conservation Standard, the permissible noise exposure per day is 96.0 dB for 10 hours or 106 dB for 1 hour. Assuming the eardrum is 9.5 mm in diameter, find the energy absorbed by the eardrum, when subjected to each of these conditions.
(a) 96.0 dB for 10 hours 0.0102 Correct: Your answer is correct. J
(b) 106 dB for 1 hour
(c) Is OSHA's safety standard simply a measure of the amount of energy absorbed by the eardrum? Correct: Your answer is correct. Explain.
Explanation / Answer
106 dB = log I - log Io
Io = 10-12 W/m2 ; log 10-12 = -12;
log I = 106 - 12 = 94
I = 1094 W/m2
Power, P = I*A ; A is the area of eardrum = pi*[d/2]2 = 3.14*[9.5*10-3*0.5]2 = 7.085*10-5 m2
P = 1094 W/m2 * 7.085*10-5 m2 = 7.08*1089 W
Enery absorbed by the eardrum, E = Power*time of exposure = 7.08*1089 W * 60 s
Enery absorbed by the eardrum, E = 4.25*1091 J
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