1. When the object is much larger than the wavelength:
* Reflection: The wave bounces off the object. This is what happens when light waves reflect off a mirror, or sound waves bounce off a wall.
* Refraction: The wave bends as it passes from one medium to another. This happens when light waves pass from air to water, causing the straw in a glass to appear bent.
* Diffraction: A small amount of bending occurs at the edges of the object. This is why you can hear sounds around corners, even though you can't see around them.
2. When the object is comparable in size to the wavelength:
* Diffraction: The wave bends significantly as it passes around the object, creating patterns of constructive and destructive interference. This is how a CD diffracts light to create its rainbow colors, or how a narrow slit diffracts light to create an interference pattern.
* Scattering: The wave is scattered in multiple directions as it interacts with the object. This is how light scatters from dust particles in the air, causing the sky to appear blue.
3. When the object is much smaller than the wavelength:
* Transmission: The wave passes through the object with minimal interaction. This is how X-rays pass through your body, or radio waves pass through walls.
Examples of wave interactions:
* Light waves: Light diffracts around the edge of a coin, creating a fuzzy shadow. Light reflects off a mirror, allowing you to see your reflection. Light refracts as it passes from air to water, causing a straw to appear bent.
* Sound waves: Sound diffracts around corners, allowing you to hear sounds even if you can't see the source. Sound waves reflect off walls and objects, creating echoes.
* Water waves: Water waves diffract around a pier, creating patterns of constructive and destructive interference. Water waves reflect off a seawall, creating standing waves. Water waves refract as they approach a shallow beach, causing them to bend towards the shore.
In summary:
The interaction between a wave and an object is governed by the relative sizes of the object and the wavelength. Waves can be reflected, refracted, diffracted, scattered, or transmitted, depending on the interaction. These phenomena have important implications in various fields, including optics, acoustics, and seismology.
