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# the frequency =100 HZ, find the the time between first crest and forth trough

how to get the time from this given

my answer is  f=100      p.t= 1/100

t=0.01 sec is that right?

### 2 Answers by Expert Tutors

4.9 4.9 (233 lesson ratings) (233)
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Hey Ako -- at 100 Hz, one cycle is 0.01s or 10ms ... 1st peak to 2nd peak => 10ms ...

to 3rd peak => 20ms ... to 4th peak => 30ms ... to next trough, add 1/2 cycle => 35ms :)

Vivian L. | Microsoft Word/Excel/Outlook, essay composition, math; I LOVE TO TEACHMicrosoft Word/Excel/Outlook, essay comp...
3.0 3.0 (1 lesson ratings) (1)
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Hi Aka;
100 Hz
(100 cycles)/(1 second)
(1 second)/(100 cycles)
We need the time between...
First crest and second crest...first cycle
second crest and third crest...second cycle
third crest and fourth crest...third cycle
fourth crest and fourth trough...half cycle
[(1 second)/(100 cycles)](3.5 cycles)
The unit of cycles is in the numerator and denominator.  It cancels...
[(1 second)/(100 cycles)](3.5 cycles)
[(1 second)/100](3.5)
[(3.5)/(100)]seconds
0.035 seconds