A worker in a factory is exposed to an ambient noise level of 96 dB(A) re 20
Question:
A worker in a factory is exposed to an ambient noise level of 96 dB(A) re 20 micro-Pa. Because it is so loud, the worker is issued with hearing protection that reduces the noise level to 74 dB(A) re 20 micro-Pa. The worker wore the hearing protection for 90% of the time during her 8-hour shift. For the remaining 10% of the 8-hour shift, the worker removed the hearing protection and was exposed to the ambient noise in the factory.
What is the effective attenuation of the hearing protection? (i.e, Calculate the difference between the ambient noise level and the worker's exposure level, LAeq,8hr.)
____________ dB [ Your answers should be accurate to within +/- 0.1 dB ]
Principles of heat transfer
ISBN: 978-0495667704
7th Edition
Authors: Frank Kreith, Raj M. Manglik, Mark S. Bohn