for a periodic motion the time taken to make one complete

cycle is called the period. The period is the time it takes for a periodic motion to repeat itself. It is usually denoted by the symbol T and is measured in units of time, such as seconds or minutes. For example, the period of a simple pendulum is the time it takes for the pendulum to swing back and forth once. The period of a sound wave is the time it takes for the wave to complete one cycle of compression and rarefaction. The frequency of a periodic motion is defined as the number of cycles completed in one second. It is usually denoted by the symbol f and is measured in units of hertz (Hz), which represents one cycle per second. The frequency and period of a periodic motion are related by the equation: f = 1/T where f is the frequency and T is the period.