As you sit on a dock, you notice a wave crest pass. you count another 16 wave crests in the next eight seconds. what is the frequency of these waves?

The SI unit for frequency is Hertz (Hz), or simply, the reciprocal of a second. It measures how fast an object could be moving. In this case, the frequency would be 16 wave crests per 8 seconds (16/8 = 2). In simplified answer, the frequency is 2 per second, or 2 Hz.