The frequency is the reciprocal of the period. In other words, divide 1 by the period. If the period is in seconds, the frequency is in hertz.
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The period is the reciprocal of the frequency, in other words, one divide by the frequency. If the frequency is in Hertz, the period is in seconds.
frequency of 10 hertz
Frequency = reciprocal of period = 1 / 0.01 = 100per second = approximately 100 Hertz = roughly 100 cycles
Count the number of waves passing a point in one second. That is frequency. Or count waves for 10 seconds and divide by 10.