What physical property is measured in Hertz?

Hertz is the unit of measurement for frequency, which is the number of cycles or oscillations that occur in a given period of time, specifically one second. For example, when we say that a signal has a frequency of 60 Hertz, it means that the signal completes 60 cycles in one second. This concept is critical in various fields, particularly in physics and engineering, where understanding how often a periodic event occurs is essential for analyzing waveforms, sound frequencies, alternating current (AC) electricity, and more.

The other options represent different physical properties: voltage is measured in volts, power is measured in watts, and resistance is measured in ohms. Each has its specific context and application, but when it comes to measuring how often an event occurs over time, Hertz is the appropriate unit, confirming that frequency is indeed the correct answer.