Question

The pressure variation that correspond to pain threshold (i.e., the ear can tolerate in loud sound) is about 30 Pa. velocity of sound in water is `sqrt(2)xx10^3m//s`. The intensity of sound wave produced in water corresponding to loud sound is
A. `1W//m^(2)`
B. `0.3xx10^-3W//m^(2)`
C. `10^3W//m^(2)`
D. `10^(-12)W//m^(2)`

Answer 1

Correct Answer - B
Intensity of sound wave `I=(P_0^2)/(2rhov)`
`=(30xx30)/(2xx10^3xxsqrt2xx10^3)=0.3xx10^-3 W//m^(2)`