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1. Resonance

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   In acoustics, resonance is fundamental to sound production. A string, air column, or cavity possesses a set of natural frequencies (harmonics) determined by its geometry and boundary conditions. When excited at these frequencies, the sound produced is significantly louder. For example, the quality of a violin's tone is highly dependent on the precise resonant frequencies of its wooden body (the sound box), which must be finely tuned to couple the string vibrations effective…