# DB question

hi, i need help in understanding something on sound. if admam works near a jet plane that is taking off and experiences the sound level of 150dB. then the protectors to reduce the sould level to that of a chain saw, what decrease in dB is needed? i think it's 40 but i am not sure.
and also if Adam hears something that sounds like a whisper then what would a person w/o protectors hear? is there even a difference....

The decibel is a logarithmic scale. The decibel level can be calculated by
$$\beta=10\log_{10}{\frac{I}{I_{0}}}$$

where $$I_{0}$$ is a constant reference intensity = $$10^{-12}W/m^{2}$$ This is roughly the intensity of a just audible sound.

Your problem can be solved only if the intensity of the chain saw is known.
I don't understand your problem .... sorry ....

who are those protectors??? and how can they reduce the sound of an aeroplane??

Last edited:
BobG