Question

how is loudness related to amplitude of wave

Answer 1

Loudness, or volume, is the way that the human ear perceives sound. At its simplest, when the amplitude is increased, sound gets louder, and when it is decreased, sound gets quieter.

Answer 2

Hey there!

Relation between Loudness and Amplitude:

Loudness is directly proportional to square of the amplitude.

i.e Loudness ∝ (Amplitude)²

Example:

When a body vibrates with a greater amplitude, it sends forth a greater amount of energy and hence the energy received by the eardrum is large, so the sound appears louder.

Hope It Helps You!