Sound frequency is commonly measured in which of the following units?

Sound frequency is measured in Hertz (Hz), which quantifies the number of cycles per second of a sound wave. This unit is fundamental in acoustics, as it enables the identification of different sounds, including pitches and musical tones. For example, a sound with a frequency of 440 Hz corresponds to the musical note A above middle C, which is a reference pitch in music.

The other units listed relate to different aspects of sound or energy. Decibels are used to measure sound intensity or loudness, but they do not indicate frequency. Horsepower measures mechanical power, often in engines or machinery, unrelated to sound characteristics. Watts measure electrical power but, similar to horsepower, are not associated with how frequently sound waves vibrate. Understanding these distinctions highlights why Hertz is the correct unit for measuring sound frequency.