@coachadamcoers I run into two acoustical questions in PDD exam1. both were asking how much decibel change would be perceived half as loud/reduce intensity by half.
I got confused because a 3db change means sounds intensity is reduced by half, but 3db change is also perceived as negligible. would you explain the rational/confirm sound intensity change is not directly related to sound perceived?
In Question 21
There are two identical fans that together produce 60 dB of sound.
If one fan is removed, what is the resulting dB level?
Answer: Reducing sound intensity by half reduces it by 3 dB. 60-3=57.
An existing open office space currently has a noise intensity level of 65 decibels. The client would like to reduce the level of noise to provide a quieter environment. Installation of acoustical panels will reduce the noise level of the space to 55 decibels.
What is the perceived change in noise intensity?
Answer: Half as loud. Incorrect. A change of 3 or fewer decibels is barely perceived.