The three aspects of sound waves are wavelength, frequency and amplitude. Wavelength describes the distance between each sound wave, and frequency relates to the number of waves counted in a specified amount of time. The energy in a sound wave is called amplitude.
The three aspects can also be seen when looking at a model of sound waves. Each sound wave has a peak and a trough, and wavelengths are the spaces measured between either the troughs or the peaks. Higher frequencies have shorter distances between the troughs or peaks. The amplitude of a sound is shown by the height of the sound wave, with higher waves tending to represent louder sounds. The more waves that occur in a period, the higher the pitch of the sound.