Question

Distinguish between loudness and intensity of sound.

Answer 1

intensity of Sound

1. Sound intensity, also known as acoustic intensity, is defined as the power carried by sound waves per unit area in a direction perpendicular to that area.
2. The SI unit of intensity, which includes sound intensity, is (W/m²).

$I=\frac{P}{A}$

Where, I is the sound intensity, P is the acoustic power, A is the normal area to the direction of propagation.

Difference between Loudness and Intensity of Sound

Loudness	Intensity of Sound
Loudness is the measure of the response of the ear to the sound.	Intensity is the sound power per unit area.
Loudness is measured in decibels.	Intensity is measured in Watt per meter square.
Loudness is dependent on the sensitivity of the human ears.	Intensity is independent of the sensitivity of the human ears.