Which of the following statements defines "true harmonic"?

The statement that defines "true harmonic" is that it is an exact multiple of a fundamental frequency. In the context of wave and sound theory, harmonics are produced when a system resonates at frequencies that are whole number multiples of a fundamental frequency. For example, if the fundamental frequency is 100 Hz, then the harmonics would occur at 200 Hz (first harmonic), 300 Hz (second harmonic), and so on. This characteristic is essential in music and physics, as it defines the harmonic series which contributes to the timbre and richness of sound.

Understanding the concept of true harmonics is critical, as it lays the foundation for analyzing complex waveforms and frequency relationships in various applications such as acoustics, electrical signals, and musical instruments. Recognizing that harmonics consist of these precise multiples helps differentiate them from other frequencies that may arise in a system but do not fall into the harmonic classification.