What does a pure sine wave at 440Hz sound like?

What does a pure sine wave at 440Hz sound like?

• A. A note at middle C
• B. A note an octave higher
• C. An A above middle C
• D. A note an octave lower

Answer: (C)

A pure sine wave contains only a single frequency, so it produces a clean, pure pitch with no extra harmonic content to color the tone. At 440 Hz, the pitch is the note A that sits above middle C (often called A4 in standard tuning). So the sound you hear is that exact pitch, with a straightforward, uncluttered tone because there are no overtones. For context, middle C is lower than this pitch, and octave shifts would move you to either a higher C (C5) or a lower A (A3) or higher A (A5) depending on the direction, but the 440 Hz pure tone specifically corresponds to the A above middle C.

A pure sine wave contains only a single frequency, so it produces a clean, pure pitch with no extra harmonic content to color the tone. At 440 Hz, the pitch is the note A that sits above middle C (often called A4 in standard tuning). So the sound you hear is that exact pitch, with a straightforward, uncluttered tone because there are no overtones. For context, middle C is lower than this pitch, and octave shifts would move you to either a higher C (C5) or a lower A (A3) or higher A (A5) depending on the direction, but the 440 Hz pure tone specifically corresponds to the A above middle C.