Which of the following is NOT one of the perceived or psychological qualities of sound waves?

A) pitch
B) purity
C) timbre
D) loudness

Psychological Qualities

The internal characteristics of an individual that influence their mental states and behaviors, including cognitive, emotional, and personality traits.

Timbre

The quality of a sound that distinguishes it from other sounds of the same pitch and volume; often referred to as the "color" of sound.

Loudness

The perception of the intensity of sound waves, often measured in decibels, and subjectively experienced by listeners.