In a lesson focused on vocal intensity, which component of a sound pressure wave is indicative of vocal loudness?

The component of a sound pressure wave that is indicative of vocal loudness is amplitude. Amplitude refers to the height of the sound wave; larger amplitudes correspond to higher energy and, thus, louder sounds. When teaching about vocal intensity, it's essential to understand that increased amplitude results in greater sound pressure levels, which are perceived as increased loudness by listeners.

In the context of sound waves, frequency relates to the pitch of the sound, not its loudness. Wavelength is associated with both frequency and the speed of sound but doesn't directly affect how loud or soft a sound is perceived. Formant bands pertain to the resonant frequencies of the vocal tract that shape the quality of the sound but do not serve as an indicator of loudness. Understanding these distinctions helps to clarify how vocal intensity can be effectively taught and measured.