Which of the following describes the number of wave cycles per second of an electromagnetic wave?

The number of wave cycles per second of an electromagnetic wave is referred to as frequency. Frequency is a fundamental property of waves, including electromagnetic waves, and it is typically measured in hertz (Hz). When discussing electromagnetic radiation, such as radio waves, microwaves, and X-rays, frequency conveys important information about the energy and behavior of the wave. Higher frequency waves carry more energy and have shorter wavelengths, while lower frequency waves have longer wavelengths.

In this context, amplitude pertains to the height of the wave and influences the intensity of the electromagnetic wave rather than its cyclic measurement. Velocity refers to the speed at which the wave propagates through a medium, which is distinct from how many cycles occur in one second. Wavelength is the distance between successive peaks of the wave and is inversely related to frequency; it does not measure the number of cycles per second. Overall, frequency is the term that captures the cyclical nature of electromagnetic waves effectively.