1. Reflection: The wave can bounce back off the boundary between two materials. This is what happens when light reflects off a mirror or sound waves bounce off a wall.
2. Refraction: The wave can change direction as it passes from one material to another. This is why a straw appears bent when placed in a glass of water.
3. Absorption: The wave can lose energy as it travels through a material. This is why sound is quieter in a padded room, and why certain materials are used to block light (like sunglasses or curtains).
Let me know if you'd like more detail on any of these phenomena!
