Question

The number of waves that pass through a point in a unit time is called its ____.

• A. wavelength
• B. frequency
• C. amplitude
• D. displacement

Answer 1

The correct option is B frequency

A wave is characterised by its frequency. Frequency is defined as the number of waves that pass through a given point in a unit time. The S.I. unit for frequency is Hertz (Hz).

For example, if a wave takes 0.5 seconds to pass through a point, then its frequency will be $\frac{1}{0.5}$ = 2 Hz.
This means that 2 waves will pass through that point in a second.