Time & Calendar
Basic
Period & Frequency
A repeating event's period is the reciprocal of its frequency.
Formula
Variables
TPeriod (s)
fFrequency (Hz)
Example
50 Hz mains ⇒ T = 0.02 s (20 ms)
Did You Know?
A caesium-133 atom oscillates 9,192,631,770 times per second — that count is the modern definition of the second.