Question on: SS3 Physics - Sound Waves

The correct answer is C. Density.

Sound waves are characterized by properties such as wavelength, frequency, and amplitude, all of which describe the wave's spatial and temporal characteristics. Density, however, is a property of the medium through which the sound wave travels, not a direct characteristic of the sound wave itself. The speed of sound is affected by the density of the medium, but the sound wave itself is defined by its wavelength, frequency, and amplitude.