Chapter 20

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Chapter 20 The Energy of Waves

• Section 3 Wave Interactions
• pp. 584 - 589

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TERMS TO LEARN

• Reflection the bouncing back of a wave after it
  hits a barrier
• Refraction the bending of a wave as it passes
  at an angle from one medium to another. The speed
  of a wave changes depending on the medium in
  which it is traveling

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TERMS TO LEARN

• Diffraction the bending of waves around a
  barrier or through an opening
• Interference a wave interaction that occurs
  when two or more waves overlap

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INTERFERENCE

• Interference can either be constructive or
  destructive.
• Constructive interference increases amplitude
  destructive interference decreases amplitude.

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INTERFERENCE

• Interference can create standing waves. A
  standing wave is a wave that forms a stationary
  pattern in which parts of the wave are at rest
  position because of total destructive
  interference and parts of the wave have large
  amplitude due to constructive inference.