KIDS TRIVIA

Detailed explanation-1: -While the pitch of a sound is defined as how shrill a sound is. It is characterized by the frequency of a sound. Thus, its unit is Hertz $(Hz)$.

Detailed explanation-2: -Sounds are higher or lower in pitch according to the frequency of vibration of the sound waves producing them. A high frequency (e.g., 880 hertz [Hz; cycles per second]) is perceived as a high pitch and a low frequency (e.g., 55 Hz) as a low pitch.

Detailed explanation-3: -The SI unit of sound or more precisely frequency is hertz denoted by Hz. The sound intensity is the sound of power per unit area, that is the SI unit is watt per square meter W/m2.