Question

What do you understand by loudness of sound?

Answer 1

1. The loudness of a sound is a phenomenon that occurs when the amplitude of the sound wave changes.
2. The sound is said to be loud if the amplitude of the sound wave is large.
3. The loudness of sound is proportional to the square of the vibration amplitude and is measured in decibels$\left(dB\right)$.
4. As a result, noises exceeding $80$ decibels are considered noise by human hearing.

Hence, the loudness of a sound wave is the intensity of the wave.