Here's why:
* Reflection: This occurs when a wave bounces off a surface. Think of a ball bouncing off a wall.
* Refraction: This occurs when a wave bends as it passes from one medium to another. Think of a straw appearing bent in a glass of water.
* Diffraction: This occurs when a wave spreads out as it passes through an opening or around an obstacle. Think of light spreading out from a narrow slit.
* Absorption: This occurs when a wave's energy is absorbed by the material. Think of a dark shirt absorbing more sunlight than a light shirt.
* Transmission: This occurs when a wave passes through a material. Think of light passing through a window.
Transmission is the only interaction where the wave continues to travel inside the material, not just at its surface. The material itself can influence the wave's speed, direction, and intensity during transmission, but the wave itself is traveling through the material's volume.
