You will know because they'll be white/yellow stuff in your tidy -whities. As well as cramps so it's just like getting any period
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you will never exactly know when you will get your period however there are some signs that your period is on its way . The first 's signs are growing pubic hair and having discharge which is a whitish stuff coming out of your private about 6 months after that happens you should be expecting your period however many girls a diffrent so results may vary.
The period is ' 1 ' divided by the frequency. (The reciprocal of the frequency.)The question tells us the frequency . . . "3 per second".So the period is 1/3rd of a second .Having the frequency, the wavelength doesn't give us any more information (except thatnow we know the speed of the wave, but that's irrelevant at the moment.)
A wave or other periodic phenomenon with a period of 1 second has a frequency of 1 Hz.
Period = 1 / frequency = 0.001 second.
That over an extended period of time of n seconds, it will have travelled a distance of n miles.