Final answer:
High-pitched waves have high frequency, short wavelength, and are measured in hertz (Hz). Sounds with a high pitch are produced by smaller objects which generate shorter wavelengths.
Step-by-step explanation:
Characteristics of a high pitch wave include a high frequency, which is the number of waves that pass a point per unit of time. This frequency is measured in hertz (Hz), or cycles per second, and high-frequency waves are typically above 15,000 Hz. High-pitch sounds, such as a bird chirp, have a shorter wavelength compared to low-pitch sounds, reflecting the relationship that a smaller object generally produces higher pitch sounds due to its ability to generate smaller wavelengths. For example, a piccolo, being a small instrument, creates short-wavelength, high-frequency sounds.