Intensity of Sound:
Intensity of a sound wave is defined as the amount of sound energy passing through a unit area per second.
Intensity of sound is given as:
- I is the sound intensity
- P is the acoustic power
- A is the normal area to the direction of propagation
Loudness is a measure of the response of the ear to the sound. The loudness of a sound is defined by its amplitude. The amplitude of a sound decides its intensity, which in turn is perceived by the ear as loudness.
Therefore, following is the table which explains the difference between loudness and intensity:
|Loudness is the measure of 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.|
|Loudness is a subjective quantity.||Intensity is an objective quantity.|
Check the video below and learn about the Characteristics Of Sound Waves: