Pitch refers to the perceived frequency of a sound, which is closely related to its wavelength. Wavelength is the physical distance between two consecutive points of a sound wave that are in phase, meaning they have the same displacement and velocity. In general, the shorter the wavelength, the higher the frequency and the higher the perceived pitch.
Here's a way to describe the pitch of a sound in terms of its wavelength:
High Pitch: Sounds with a high pitch have a shorter wavelength. The peaks and troughs of the sound wave are closer together. These sounds are typically associated with high-frequency vibrations, such as a whistle or a bird chirping.
Low Pitch: Sounds with a low pitch have a longer wavelength. The peaks and troughs of the sound wave are further apart. These sounds are typically associated with low-frequency vibrations, such as a bass guitar or a deep male voice.
Frequency Range: The pitch of a sound can fall within a certain frequency range. The audible range for humans is typically considered to be between 20 Hz (low pitch) and 20,000 Hz (high pitch). Sounds below this range are infrasound (ultra-low frequency), while sounds above this range are ultrasound (ultra-high frequency).
It's important to note that pitch is a perceptual quality of sound, whereas wavelength is a physical characteristic. While there is a correlation between pitch and wavelength, our perception of pitch can also be influenced by factors such as harmonics, timbre, and the characteristics of our auditory system.