The property that describes the number of waves that move past a point each second is frequency.

Here's why:

* Frequency is a measure of how often a repeating event occurs. In the case of waves, it's the number of cycles (or crests, or troughs) that pass a fixed point in one second.

* Wavelength is the distance between two consecutive crests or troughs of a wave.

* Amplitude is the maximum displacement of a wave from its equilibrium position.

* Speed is the rate at which a wave travels through a medium.

Therefore, frequency directly quantifies the number of waves passing a point per second.