What is loudness of sound ? What factors does it depend on ?

Solution:
The loudness of the sounds humans perceive relates to the intensity of the audible sound. Loudnessis a subjective property of the sound that depends on the human ear, the sensitivity of the ear to the frequency of the sound, and the distance from the source of the sound. Loudness of the sound depends inversely on the square of the distance of the observer from the source of sound, and is directly proportional to the square of the amplitude of the sound wave.