Q. Intensity level of sound of intensity $I$ is $30\ dB.$ The ratio $\frac{I}{I_{0}}$ is (Where $I_{0}$ is the threshold of hearing)
A) 3000
B) 1000
C) 300
D) 30
Explanation
(b) $L = 10\log_{10}{\left( \frac{I}{I_{0}} \right) = 30 \Rightarrow \frac{I}{I_{0}} = 10^{3}}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.