select the correct answer.\nwhat can be found by counting the number of troughs per second in a wave…

select the correct answer.\nwhat can be found by counting the number of troughs per second in a wave diagram?\na. amplitude\nb. direction\nc. frequency\nd. speed\ne. wavelength
Answer
Brief Explanations:
Frequency is the number of complete cycles (including troughs) per unit time. Counting troughs per second gives frequency.
Answer:
C. frequency