Question

A residence requires smoke alarms within a bedroom and in the corridor directly outside the bedroom. The ambient noise level in the bedroom is 60 dB, and a solid-core door reduces the noise level by 25 dB. Determine the minimum decibel ratings for the bedroom smoke alarm and the corridor smoke alarm. Show your work

Answer 1

The loudness is added as follows

L = 10 log (10^L1/10 + 10^L2/10 )

= 10 log (10^60/10 + 10^25/10 )

= 60 dB

This is the minimum sound level required by the smoke alarm

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