Question

What does the frequency of a wave represent?

the distance between two consecutive crests
the number of wave cycles that pass through a specific point within a given time period
the distance between the highest and lowest points of a wave the length of wave that pass through a specific point within a given time period

Answer 1

Frequency of the wave represents the number of crests/troughs (waves) crossing a particular point in the medium in one second
This is actually the definition