Answer:
The relationship between period and frequency is inverse.
Period is the time it takes for a repeating event to occur, and is usually measured in seconds. Frequency is the number of times an event occurs in a given period of time, and is usually measured in Hertz (Hz), which is the number of events per second.
An inverse relationship means that as one value increases, the other value decreases, and vice versa. In the case of period and frequency, as the period (time) of a repeating event increases, the frequency (number of events per second) decreases, and as the period decreases, the frequency increases.
For example, if a wave has a period of 2 seconds, it means that it takes 2 seconds for one complete wave cycle to occur. If we measure the frequency of this wave, it would be 0.5 Hz (1 event per 2 seconds), because there is one complete wave cycle every 2 seconds. If we doubled the period of the wave to 4 seconds, the frequency would be 0.25 Hz (1 event per 4 seconds), because there would be one complete wave cycle every 4 seconds.
I hope this helps! Let me know if you have any questions or if you need further clarification.