Answer: Option (4) is the correct answer.
Explanation:
Number of waves that pass through a given point in a per unit time is defined as frequency.
Therefore, when each crest or trough of a wave are closer then it means frequency of the wave is greatest. Whereas when each crest or trough of a wave are far away from another crest or trough of the same wave then it means frequency of wave is the smallest.
Thus, we can conclude that out of the given waves, option four displays a wave with greatest frequency.
