How is frequency measured?

Frequency is measured in cycles per second, which quantifies how many times a periodic event occurs within one second. This measurement reflects the rate of oscillation of a waveform or signal, commonly encountered in fields such as avionics. The term "cycle" refers to one complete wave or oscillation, so when an event repeats, the frequency describes how often that event occurs over time.

The hertz (Hz) is a common unit of measurement for frequency, defined as one cycle per second. Though "hertz per second" appears in the choices, it is not a standard unit for frequency, which is simply measured in hertz (Hz). Therefore, cycles per second effectively represents the same concept, making it the correct answer. Understanding frequency is crucial in avionics since many systems rely on precise oscillations for operation, such as communication and navigation systems.