Question

Intensity level of sound whose intensity is $10^{-8}$ $w{m}^{-2}$ is

• A. 8 dB
• B. 4 dB
• C. 40 dB
• D. 80 dB

Answer 1

Answer: (C)

Intensity level of sound $=10log\frac{I}{I_0}dB$
$=10log\left(\frac{10^{-8}}{10^{-12}}\right)dB=40dB$
$\left(\because I_0=10^{-12}W/m^2\right)$