Which parameter is indicated by the number of waves passing through a given point in one second?

Frequency refers to the number of waves passing through a given point in one second. It is typically measured in Hertz \((\mathrm{Hz})\), where 1 Hz is equal to one wave passing per second.
Here's a brief explanation of the other options:
- (A) Wavelength: The distance between two consecutive points in phase on a wave (e.g., from crest to crest or trough to trough).
- (C) Wave number: The number of wavelengths per unit distance, typically measured in inverse meters ( \(1 / \mathrm{m}\) ).
- (D) Amplitude: The maximum displacement of a wave from its equilibrium position, related to the wave's intensity but not its frequency.