For a soft sound, the amplitude of the sound wave would be relatively small. Amplitude refers to the maximum displacement of particles in a medium from their resting or equilibrium position when a sound wave passes through it. In simpler terms, it represents the magnitude or strength of the sound wave.
A soft sound corresponds to a lower intensity or energy level compared to a loud sound. This lower intensity is reflected in the smaller amplitude of the sound wave. Visually, if you were to represent the sound wave graphically, a soft sound would be represented by a waveform with smaller peaks and troughs, indicating a smaller variation in pressure or particle displacement.
In summary, a soft sound would have a smaller amplitude, indicating a lower magnitude or strength of the sound wave.