https://twetch.app/t/3eab6b48e23ef07d0553c5482c2c359c04eb42…

https://twetch.app/t/3eab6b48e23ef07d0553c5482c2c359c04eb42259b61c911834e17bbda483666
The period is the duration of time of one cycle in a repeating event, so the period is the reciprocal of the frequency.