Frequency is defined as?

• A. The number of waves per second (Hz)
• B. The loudness of a sound
• C. The duration of a note
• D. The speed of sound in air

Answer: (A)

Frequency is about how often the wave repeats in time. It tells you how many cycles pass a given point in one second, and it’s measured in hertz (Hz), where 1 Hz means one cycle per second. In music, higher frequency corresponds to higher pitch, and lower frequency to lower pitch. The other options describe different properties: loudness relates to the wave’s amplitude (how strong the sound is), the duration of a note refers to its length or rhythmic value, and the speed of sound in air is about how fast waves travel through the medium, not how frequently they repeat.