Question

Comment on the statement 'loudness of sound is a subjective quantity, while intensity is an objective quantity.'

Answer 1

Sound loudness is a subjective term describing the strength of the ear's perception of a sound. It is intimately related to sound intensity but can by no means be considered identical to intensity. The sound intensity must be factored by the ear's sensitivity to the particular frequencies contained in the sound.
Intensity is an objective comparison of sound power per unit area. But the ear responds in a non-linear way to that sound intensity.