The number of anti-nodes in a string indicates the harmonic, while the number of nodes in an open tube also denotes the harmonic. This distinction highlights the different behaviors of strings and tubes in wave mechanics. Participants confirm the accuracy of this statement, emphasizing the relationship between harmonics and the physical characteristics of these mediums. Understanding these concepts is crucial for studying sound waves and musical acoustics. The discussion reinforces foundational principles in physics related to harmonics in different systems.