Question

what happens to the loudness of a sound if its amplitude decreases

Answer 1

A sound wave’s amplitude relates to changes in pressure. The sound is perceived as louder if the amplitude increases, and softer if the amplitude decreases.  This is illustrated below.

Answer 2

The loudness of wave decreases if its amplitude decreases.

Explanation:

The loudness of sound depends on the amplitude of wave. On decreasing the amplitude of the sound wave, its loudness gets decreased.  We know that the intensity of a wave is directly proportional to the square of its amplitude. As a result, on decreasing the amplitude of a wave, its intensity gets decreased.

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Sound wave

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