<h2>Answer: medium </h2><h2 />
The propagation velocity of a wave depends on the medium in which it propagates.
In addition, it depends on the type of wave, for example a mechanical or electromagnetic wave.
In any case, the velocity of a wave is generally related to the value of the wavelength and the period, and can be expressed mathematically through the following formula:
where
is the velocity of the wave,
is the wavelength and
is the period.
Therefore:
<h2>The propagation velocity of a wave depends on the <u>medium</u></h2>