Question

In expressing sound intensity, we take ${10}^{-12}$ $W/m^2$ as the reference level. For ordinary conversation, the intensity level is about ${10}^{-6}$ $W/m^2$. Expressed in decibel, this is

• A. ${10}^6$
• B. 6
• C. 60
• D. $loge\left({10}^6\right)$

Answer 1

The correct option is C 60

$B=10lo{g}_{10}\left(\frac{I}{I_0}\right)=10lo{g}_{10}\left(\frac{{10}^{-6}}{{10}^{-12}}\right)=60dB$