Question

can electromagnetic waves travel through a medium? no, it is not possible for them to travel through a medium yes, but they travel slower through mediums such as air and water

Explanation:

Electromagnetic waves can travel through a medium. In a vacuum, they travel at the speed of light \(c = 3\times10^{8}\text{ m/s}\). When they enter a medium like air (\(n\approx1\)) or water (\(n = 1.33\), where \(n\) is the refractive index), their speed \(v=\frac{c}{n}\). Since \(n> 1\) for these media, \(v < c\).

Answer:

yes, but they travel SLOWER through mediums such as air and water