Frequency
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1-1-235
Reciprocal of the period.
Symbol f, ?
Note: 1 When the independent variable is time, the unit of frequency is the hertz.
Unit hertz (Hz) lHz = l/s
Reference: C.I.E.
Note: 2 In Britain, France and U.S.A. cycles per second (cps or c/s) have been used for "hertz".
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)