What is a complex tone?

• A. A sound consisting of multiple sine waves combined together.
• B. A single pure tone
• C. A noise segment
• D. A damped sound

Answer: (A)

A complex tone is a sound built by adding together several sine waves with different frequencies. In music and acoustics, most tones aren’t just a single pure frequency; they consist of a fundamental frequency plus a set of harmonics or partials. Each of these components is a sine wave, and their sum creates a richer, more instrument-like timbre. A single pure tone is just one sine wave, so it isn’t complex. A noise segment contains many frequencies in a random mix, without the orderly harmonic structure of a sum of discrete sine waves. A damped sound describes how the amplitude fades over time, not the number of frequency components. Therefore, the description of multiple sine waves added together best captures a complex tone.