High frequency sound waves are known as:

High frequency sound waves are referred to as overtones. In acoustics, overtones are the higher frequency sound waves that resonate along with the fundamental frequency, which is the lowest frequency produced by any vibrating object. When a musical instrument is played, it typically produces a fundamental frequency, along with a series of overtones that contribute to the richness and timbre of the sound produced. This harmonic relationship is essential in music, as it enables complex sound combinations.

In contrast, fundamental waves are characterized by their primary frequency without the additional, higher-pitched harmonics that are termed overtones. The terms consonance and dissonance refer to the relationship between different pitches and the auditory effects they create, rather than directly describing the frequency of sound waves. Thus, overtones effectively define high frequency sounds that occur alongside a fundamental frequency, making this the accurate choice.