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Criteria for background noise (in NC) in hospitals and apartments is
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- 10 - 20
- 20 - 30
- 30 - 40
- 40 - 50
Correct Option: B
Noise Criteria for Rooms Noise criteria (NC) curves can be used to evaluate existing situations by measuring sound levels at the loudest locations in rooms (preferably at user ear height).
They can also be used to specify the steady, or continuous background noise levels needed to help achieve satisfactory sound isolation, provided levels are 4 to 5 dB below the NC curve at both the low and high frequencies.The table below presents recommended NC ranges for various indoor facilities.
