Question

What is the loudness of sound? What factors does it depend on?

Answer 1

Definition

1. The loudness of a sound is a phenomenon caused by the amplitude of the sound wave.
2. The sound was said to have been loud if the amplitude of the sound wave was sufficiently large.
3. This same loudness of sound is represented throughout decibels, being directly proportional to the squared amplitude of vibration (dB). As a result, sounds exceeding $80\mathrm{decibels}$ constitute noise to human hearing.

Factors does it depend on

Intensity is determined by factors:

1. The amplitude of the sound waves and their distance from the sound source.
2. It is determined by the quantity of energy that initiated the waves.
3. Waves with a higher amplitude have much more energy or intensity, thus they sound louder.