Question

Figure 1 shows a wave movement during 1 second. What is the frequency of this wave?

Answer 1

2 hertz is the answer

Answer 2

From the figure given we can see that there are 2 waves produced or traveled after 1 second. The frequency of the wave is calculated by dividing the number of waves by time. From this given, the frequency is,
frequency = 2 waves / 1 s
frequency = 2/s
frequency = 2 Hz