Question: Q 9 . A construction worker leaves an 8 5 d B environment after 2 hours and works in a 9 4 d B environment

Q9. A construction worker leaves an 85dB environment after 2 hours and works in a 94dB environment for 2 hours and then works in an 89dB environment for another 4 hours. What are the (a) dose and (b) time weighted average?
Q 9 . A construction worker leaves an 8 5 d B

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