Soft sounds are produced when the amplitude of vibration is ______.
Small
The loudness of a sound depends on the amplitude of vibration of the source: the energy carried by the sound, and so how loud it seems, increases with amplitude (it is proportional to the square of the amplitude).
A source vibrating with a small amplitude pushes the air only slightly, so it produces a soft sound. A large amplitude gives a loud sound.
Zero amplitude means the source is not vibrating at all, so no sound is produced, and an infinite amplitude is not physically possible. Therefore soft sounds come from small amplitudes.
Hence, Small.
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