Question

State whether true or false:

We can compare intensities of two sound waves even of different frequencies and travelling in same medium by simply measuring their pressure amplitudes.

• A. True
• B. False

Answer 1

The correct option is A True

Intensity $I$ is related to pressure amplitude $P_0$ by

$I=\frac{1}{2}\frac{P_0^2}{\rho v}$ where $\rho$ is the energy density and v is the velocity of the wave.

By measuring $P_0$ one can get the velocity of the wave.