Uchiwa is a traditional Japanese fan. It is often used to create a breeze to keep cool in hot weather. They are part of Japanese seasonal traditions and are …

A time period (denoted by 'T'' ) is the time taken for one complete cycle of vibration to pass a given point. As the frequency of a wave increases, the time period of the wave decreases. The unit for time period is 'seconds'. Frequency and time period are in a reciprocal relationship that can be expressed mathematically as: T = 1/f or as: f = 1/T.