Question

frequency is... the speed of the wave over a given unit of time how long it takes for one wave to pass in a given unit of time the length of the wave in a given unit of time the number of waves that pass a fixed point in a given unit of time

Explanation:

Frequency in waves is defined as the number of waves that pass a fixed - point in a given unit of time. The first option describes wave speed, the second option describes the period (time for one wave to pass), and the third option describes wavelength.

Answer:

The number of waves that pass a fixed point in a given unit of time