5. Any repeated and periodic motion can be described by a frequency. For instance, the frequency of rotation of a second hand on a clock is __ 1/60Hz b. 1/12Hz c. 1/2Hz d. 1 Hze 60 Hz

The correct answer is a. $1/60Hz$.<br /><br />The frequency of rotation of a second hand on a clock is $1/60Hz$. This is because the second hand completes one full rotation every 60 seconds, which corresponds to a frequency of $1/60$ Hz.