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Behavior of Waves 17-3

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?

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Quick Quiz Questions

  • This occurs when the wave enters a new medium.
    • reflection, refraction, diffraction
  • In __, when two parts of a wave travel through different mediums, the parts move at different speeds
    • reflection, refraction, diffraction

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  • The formation of a __ wave requires interference between incoming and reflected waves.
    • Standing, transverse, surface

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Wave: Reflection

  • Reflection = when a wave bounces off a surface that it cannot go through
  • Ex. Ball bouncing off a wall
  • Reflections do not:
    • Change the speed or
    • Frequency of the wave but
    • The Wave can be flipped upside down

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Wave: Refraction

  • Refraction = the bending of a wave as it enters a new medium at an angle
  • Refraction occurs because one side of the wave moves more slowly than the other side

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Wave : Diffraction

  • Diffraction = is the bending of a wave as it moves around an or obstacle passes through a narrow opening
  • A wave diffracts more if its wavelength is large compared to the size of

an opening or obstacle

  • The larger the wavelength is compared to the size of the opening or obstacle the more the wave diffracts

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Wave: Interference

  • Interference = When two or more waves overlap or combine together
  • Constructive Interference = Two or more waves combining to make a larger displacement
  • Destructive Interference = Two or more waves that combine to make a smaller displacement

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Standing Wave

  • Standing wave = a wave that appears to not be moving.
  • Ex. if you Pluck a string on a Guitar.
  • Node = point of a standing wave with no displacement.
  • Antinode = point where trough and crest are halfway between nodes.

Node Antinode

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Diffraction Node Antinode

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Quick Quiz

  • This occurs when the wave enters a new medium.
    • refraction

​

  • In __, when two parts of a wave travel through different mediums, the parts move at different speeds
    • refraction

​

  • The formation of a __ wave requires interference between incoming and reflected waves.
    • Standing