Question

What is the frequency of a wave that has 6 cycles pass through in 3 seconds?

Answer 1

Waves are described and measured by five wave parameters: the period, the frequency, the amplitude, the wavelength, and the speed. The period of a wave is the time it takes to complete one cycle. The frequency is just the opposite; it's the number of wave cycles that are completed in one second.

Answer 2

https://www.physicsclassroom.com/class/waves/Lesson-2/Frequency-and-Period-of-a-Wave
Frequency and Period of a Wave - The Physics Classroom