a worker is exposed to an 8 hour twa noise exposure of 98 dba. what minimum...
a worker is exposed to an 8 hour twa noise exposure of 98 dba. what minimum NRR would be needed to confidently ensure that the workers hearing protection would be below 85 dBA? (show all work)
Homework Answers
let the NRR of the hearing proteciton be x
then
exposure, y = 98 dba
rwquired output, z = 85 dba
hence
z = y - (x - 7)/2
85 = 98 - (x - 7)/2
hence
NRR protection of 33 will ensure that the worker hears below 85
dba
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