What is the term for the interval between the commencement of two cycles of light?

The interval between the commencement of two cycles of light is referred to as the period of light. This term specifically denotes the time it takes for one complete cycle of a light wave to occur before the next cycle begins. In the context of wave dynamics, such as light and sound waves, the period is a fundamental characteristic, directly related to how we perceive the frequency of the wave.

Frequency, on the other hand, is the number of cycles that occur in one second, which is the inverse of the period. While both frequency and period are closely related concepts in wave mechanics, the question specifically asks for the term describing the duration of time between cycles, supporting the rationale for the period of light as the correct answer.