Which unit is commonly used to express frequency?

Which unit is commonly used to express frequency?

• A. Meters
• B. Hertz
• C. Pascals
• D. Lux

Answer: (B)

Frequency is how many cycles happen in one second. The unit that expresses that rate is the Hertz, defined as one cycle per second. Hz is the standard way to name frequency in the SI system, and you’ll also see frequency written as s^-1. For example, a sound at 440 Hz means 440 cycles occur each second. The other units measure different quantities—meters gauge length, pascals measure pressure, and lux measures illuminance—so they don’t describe how often something repeats.

Frequency is how many cycles happen in one second. The unit that expresses that rate is the Hertz, defined as one cycle per second. Hz is the standard way to name frequency in the SI system, and you’ll also see frequency written as s^-1. For example, a sound at 440 Hz means 440 cycles occur each second. The other units measure different quantities—meters gauge length, pascals measure pressure, and lux measures illuminance—so they don’t describe how often something repeats.