If A4 vibrates at 440 Hz, what is the frequency of its 2nd overtone if the tone is purely harmonic?
Answer
1320 Hz
In a harmonic series, the fundamental is the 1st harmonic (1f0). The 1st overtone is the 2nd harmonic (2f0, or 880 Hz). Therefore, the 2nd overtone is the 3rd harmonic (3f0), calculated as 3 * 440 Hz = 1320 Hz.

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