( 1 ) divided by (the frequency of the vibrations).
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We clearly heard you say "one complete cycle every 2 seconds". That means that the period is 2 seconds. No calculation or arithmetic of any kind is needed.
3,600 seconds in one hour.
90 seconds
In one minute there are 60 seconds. In one hour there are 60 minutes & 3600 seconds.
One trillion of them.