The loudness of sound depends upon the

Explanation

Pitch –

• The pitch of a sound is the characteristic which distinguishes between a sharp sound and a flat sound. The pitch we hear depends on the frequency of the sound waves with the amplitude unchanged.
• A sound of high pitch is said to be shrill and it's frequency is high.
• A sound of low pitch is said to be grave and it's frequency is low

Loudness –

• Characteristic of sound, on account of which the sound appears to be intense or slow.
• The loudness that we sense is related to the intensity of sound though it is not directly proportional.
• The loudness depends on intensity or amplitude as well as upon the sensitiveness of ear.
• The relation between the loudness and the intensity is given by –

Intensity ∝ A²

Where A is the amplitude.