Figure 17-1 shows a wave movement during 1 second. what is the frequency of this wave?

a. 2 hertz
b. 2 meters/second
c. 0.5 second
d. 1 hertz

Based on the given figure above, the correct answer would be option A. 2 hertz. The frequency of the wave movement during 1 second is 2 hertz. Since 2cycles/second is equal to 2 hertz. You can also get this answer by using the wave-speed equation which is c=νλ. Hope this answers your question. 

A research that deals with matter and energy and their relationships.

Or  a given system's physical mechanisms and phenomena. B: the physical characteristics of something and its structure

Explanation:

Depends on what u are talking about