Which property of a sound wave is most closely related to pitch?

• A. Volume/Loudness
• B. Amplitude
• C. Tone
• D. Pitch

Answer: (D)

Pitch is the sensation of how high or low a sound seems, and it comes from the frequency of the sound wave—the number of vibrations per second. When the air vibrates more quickly, the frequency is higher and the pitch sounds higher; when it vibrates more slowly, the frequency is lower and the pitch sounds lower. The loudness you hear depends on the amplitude of the wave, not its pitch, while the tone (timbre) describes the sound’s color or quality, which arises from the mix of frequencies and doesn’t determine the pitch by itself. Since pitch is specifically tied to frequency, the option that names pitch best matches the concept, while the others describe loudness or timbre.