What unit is used to measure frequency?

• A. Decibel
• B. Newton
• C. Hertz
• D. Pascal

Answer: (C)

Frequency, which is a fundamental concept in wave phenomena, including sound, is measured in Hertz. One Hertz is defined as one cycle per second, which helps quantify how often a sound wave oscillates within a given time frame. This measurement is crucial for understanding sound pitch; higher frequencies correspond to higher pitches, while lower frequencies relate to lower pitches.

The decibel is a unit used to measure sound intensity or pressure level, not frequency. Newton is a unit of force, reflecting the effect of gravity and mass, and does not relate to frequency measurements. Pascal is a unit of pressure, utilized in various scientific fields but again unrelated to the concept of frequency. Thus, Hertz is the appropriate unit for measuring how frequently sound waves cycle over time.