In which of the following loudness of a sound depends:

The amplitude of a sound wave is the measurement of the wave's height. The amplitude of a sound wave is defined as its loudness or the amount of maximum displacement of the medium's vibrating particles from their mean position when the sound is produced.

The amplitude of sound waves determines the loudness. If the amplitude is high, the sound will be louder, but it will be weak. The sound will be slower if the amplitude is low.