Question

what is relationship between amplitude and loudness.​

Answer 1

As with pitch, the loudness of a sound is a subjective measure – it depends on the person. You may have an elderly relative who listens to the TV at what seems to be ear-shattering volume to you, and yet is comfortable for their ears. The same sound is judged to be of different loudness by two people.

A more objective measurement of loudness is the amplitude of the vibration.

The human ear is sensitive to sounds over a huge range of loudness. For example, the loudest sound that the ear can safely detect without suffering any physical damage is more that one billion times more intense than the threshold of hearing (where sounds can just be heard).

The ear responds to sounds of different loudness in such a way that huge increases in amplitude are registered as small increases in loudness.

Answer 2

$<div style="color: #FFFFFF; font: normal 18px arial, sans-serif; background-color: #347c17; border: #ff0000 4px solid; width: 70%; margin: 0 auto; padding: 4px 5px 3px 5px; -moz-border-radius: 17px; -webkit-border-radius: 17px; border-radius: 17px; -moz-box-shadow: 5px 5px 5px rgba(0, 0, 0, 0.20); -webkit-box-shadow: 5px 5px 5px rgba(0, 0, 0, 0.20); box-shadow: 5px 5px 5px rgba(0, 0, 0, 0.20)"><marquee scrolldelay="250"><b><u>Hello</u> </b></marquee>$

$<p style="color:cyan;font-family:cursive;background:black;font size:40px;">Answer:-</p>$

The amplitude of a sound wave determines its loudness or volume. A larger amplitude means a louder sound, and a smaller amplitude means a softer sound.