Final answer:
To calculate the frequency of a wave on a graph, determine the average distance and time values and use the formula frequency (f) = 1 / period (T).
Step-by-step explanation:
To calculate the frequency of a wave on a graph, you need to know the time intervals between successive dots.
First, determine the average distance and average time values from the graph. Then, use the formula frequency (f) = 1 / period (T) to calculate the frequency.
For example, if the average period is 0.625 s, the frequency would be 1 / 0.625 = 1.6 Hz.