The time required for one cycle is called the what?

The correct choice is "Period" because in the context of cycles, the period specifically refers to the duration of one complete cycle of a repetitive process. This term is commonly used in physics and engineering to describe the time it takes for a system to complete a full cycle of motion or a waveform to repeat itself.

Understanding the concept of the period is crucial as it helps to analyze systems that operate in cycles, such as alternating current in electrical systems or oscillating mechanical systems. The period is mathematically related to frequency, which represents the number of cycles that occur in one second. While frequency is an important concept, it doesn’t define the time taken for one cycle, which is precisely what the period does.

The other options do not correctly define the time taken for one cycle. Cyclic time suggests a repeat without specifying the duration, duration is more general and doesn't specifically relate to cycles, and frequency, as mentioned, refers to the number of cycles per unit of time rather than the time for one complete cycle.