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By taking the
reciprocal of how many seconds a single cycle takes (reciprocal of "seconds
per cycle" is "cycles per second"), the number of cycles occurring in a
given period of time such as a second or minute can be calculated.
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For example, if
a cycle takes 1/50th of a second, the frequency is 50 cycles per second
(50 "Hertz"), or 3000 cycles per minute (3000 cpm or 3kcpm).
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That number -
how many cycles occur in a given time period - is known as the vibration
"frequency".
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