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=17.3 Behavior of Waves=


 * Refraction**- The bending of a wave as it enters a new medium at an angle.

Diffraction is when a wave is bent around an object that passes into a narrow opening. A wave will diffract more if the wavelength is larger compared to the size of the opening or obstacle. If there is a small obstacle the wave will bend very little. Diffraction is most common in water and liquids. Waves hitting an ocean rock would be an example of diffraction.
 * Ex.) A lawnmower turns when it is pushed at an angle from grass to gravel.
 * Ex.) As an ocean wave approaches the shore at an angle, the wave bends or refracts, because one side of each wave front slows down before the other side does.
 * the direction of the lawnmower changes because one wheel enters the gravel before the other one does. The wheel is still moving at a faster speed on the grass.
 * Speed difference between the two wheels causes the lawnmower to change direction.
 * when a wave enters a meduim at an angle, refraction occurs because one side of the wave moves more slowly than the other side.
 * Reflection: occurs when a wave bounces off of a surface that is can not pass through.**
 * media type="custom" key="5862679"[[image:reflection_pic2.jpg width="238" height="160"]]
 * in the video the dotted line can not pass through the surface so it bounces off.
 * Ex) a shadow in a pool is an example off reflection because the light from the sun bounces off and shows te reflection of whatever is by the pool.
 * Standing Waves**
 * is a wave that appears to stay in one place it does not seem to move through the medium
 * a standing wave form only if half a wavelength or a multiple of a half wavelength fits exactly into the length of vibrating cord
 * Diffraction**

=**Interference:**= __Constructive__
 * occurs when 2 or more waves overlap and combine together.
 * there are two different types of interference, constructive and destructive.
 * occurs when 2 or more waves combine to produce a wave with a larger displacement.

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Destructive__
 * this type occurs when 2 or more waves combine to produce a wave with a small displacement.
 * in simpler words the waves cancel eachother out to form a smaller wave.