For a wave, wavelength divided by the time period is equal to:

wave velocity

The correct answer is option 4. wave velocity.

For a wave, wavelength divided by the time period is equal to wave velocity.

Here's the formula that relates these wave properties:

\(\nu = \frac{\lambda }{T}\)

Where:

\(\nu \) represents the wave velocity (speed at which the wave travels)

\(\lambda\) (lambda) represents the wavelength (distance between two consecutive crests or troughs of the wave)

\(T\) represents the time period (time taken for one complete cycle of the wave)