Question

1. ___ is how high or low a sound is. pitch amplitude purity

Explanation:

• Pitch: It is a perceptual property of sounds that allows their ordering on a frequency - related scale (high - low).
• Amplitude: It is related to the loudness of a sound. A higher amplitude generally means a louder sound.
• Purity: It is related to the timbre or the quality of a sound, which is what makes different instruments or voices with the same pitch and loudness distinguishable.

Since the question is about how high or low a sound is, the relevant concept is pitch.

Answer:

Pitch