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# Ch 17 3 Behavior Of Waves

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### Ch 17 3 Behavior Of Waves

1. 1. Behavior of Waves How Does Reflection Change a Wave? What Causes the Refraction of a Wave When It Enters a New Medium? What Factor Affects the Amount of Diffraction of a Wave? What Are Two Type of Interference? What Wavelengths Will Produce a Standing Wave?
2. 2. Wave: Reflection <ul><li>Reflection = when a wave bounces off a surface that it cannot go through </li></ul><ul><li>Ex. Ball bouncing off a wall </li></ul><ul><li>Reflections do not: </li></ul><ul><ul><li>Change the speed or </li></ul></ul><ul><ul><li>Frequency of the wave but </li></ul></ul><ul><ul><li>The Wave can be flipped upside down </li></ul></ul>
3. 3. Wave: Refraction <ul><li>Refraction = the bending of a wave as it enters a new medium at an angle </li></ul><ul><li>Refraction occurs because one side of the wave moves more slowly than the other side </li></ul>
4. 4. Wave : Diffraction <ul><li>Diffraction = is the bending of a wave as it moves around an obstacle or passes through a narrow opening </li></ul><ul><li>A wave diffracts more if its wavelength is large compared to the size of an opening or obstacle </li></ul><ul><li>The larger the wavelength is compared to the size of the opening or obstacle the more the wave diffracts </li></ul>
5. 5. Wave: Interference <ul><li>Interference = When two or more waves overlap or combine together </li></ul><ul><li>Constructive Interference = Two or more waves combining to make a larger displacement </li></ul><ul><li>Destructive Interference = Two or more waves that combine to make a smaller displacement </li></ul>
6. 6. Standing Wave <ul><li>Standing wave = a wave that appears to not be moving. </li></ul><ul><li>Ex. if you Pluck a string on a Guitar. </li></ul><ul><li>Node = point of a standing wave with no displacement. </li></ul><ul><li>Antinode = point where trough and crest are halfway between nodes. </li></ul>Node Antinode
7. 7. <ul><li> Diffraction Node Antinode </li></ul>