When a wave pulse encounters a boundary between two media, how is the wave behavior best characterized immediately after crossing?

When a wave pulse crosses the boundary between two different media, its behavior can be characterized by changes in amplitude. This occurs because the properties of the two media, such as density and elasticity, differ, which affects how the wave propagates. When the wave enters a new medium, part of its energy is transmitted into the new medium, while some may be reflected back at the boundary.

The change in amplitude is a direct result of these interactions. For instance, if the second medium is denser than the first, the wave can be transmitted with a lower amplitude, and if it is less dense, the amplitude may increase. Therefore, it is correct to say that there are changes in amplitude immediately after the wave crosses into the new medium because the energy distribution of the wave is affected by the characteristics of both media.