How does the speed of an electromagnetic wave vary in media of different densities?

Question

Responses
A In denser media, electromagnetic waves speed up.In denser media, electromagnetic waves speed up.
B In denser media, electromagnetic waves slow down.In denser media, electromagnetic waves slow down.
C Electromagnetic waves travel at the same speed regardless of the density of the media.Electromagnetic waves travel at the same speed regardless of the density of the media.
D In less dense media, electromagnetic waves will speed up and then slow down.

Answer 1

The correct response is:

B In denser media, electromagnetic waves slow down.

Electromagnetic waves, such as light, travel at different speeds depending on the medium they are passing through. In general, they travel slower in denser media due to interactions with the atoms in the material, which affects the wave's velocity.