Sound Level Equation

[an aspiring doctor]

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In the sound level equation: B= 10log I/Io. What do you use as Io the reference intensity? I read that it is a number set at a threshold frequency. What is that number?

 

[osjx-82]

10^-12 Watts/m^2

 

[an aspiring doctor]

Thank you I knew it had to be that number because I saw it in an example.