Answer
$60$ cycles per second or $60$ Hz
Work Step by Step
Frequency is the the number of cycles, or periods, completed in 1 second.
Since the period is $\frac{1}{60}$, one cycle is completed in $\frac{1}{60}$ second. Therefore, in one second, $60$ cycles are completed. This means that the frequency is $60$ cycles per second or $60$ Hz.