What is the SI unit used to measure frequency?

The SI unit used to measure frequency is Hertz (Hz). Frequency refers to the number of cycles of a periodic wave that occur in one second. Specifically, one hertz is defined as one cycle per second. This measurement is critical in various fields, such as physics and engineering, where understanding oscillations, waves, and alternating currents is essential.

The other units mentioned are associated with different physical quantities. For instance, the joule measures energy, the watt measures power, and the newton measures force. Each has its distinct application, but they are not related to the measurement of frequency. Understanding these distinctions helps clarify the specific role that Hertz plays in the broader context of physical measurements.