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Wave Behavior. Unit 7 –Lecture 3. Clarity. Substances have varying levels of clarity – transparent materials allow waves to pass through with minimum or no distortion. Clarity. Substances have varying levels of clarity –

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wave behavior

Wave Behavior

Unit 7 –Lecture 3

clarity
Clarity
  • Substances have varying levels of clarity –
    • transparent materials allow waves to pass through with minimum or no distortion
clarity1
Clarity
  • Substances have varying levels of clarity –
    • translucent materials allow waves to pass through them with varying degrees of distortion
clarity2
Clarity
  • Substances have varying levels of clarity –
    • opaque materials do not allow waves to pass through them
      • waves must be reflected or absorbed
reflection
Reflection
  • occurs when a wave strikes an object and bounces off of it
    • echos (& echolocation)
    • image in mirror
reflection1
Reflection
  • Law of Reflection
    • the angle of incidence [input] must equal the angle of reflection [output]
mirrors
Mirrors
  • mirrors must be smooth so all the angles line up to make a clear picture in the reflection [plan(e/ar)]

Smooth Surface Rough Surface

mirrors1
Mirrors
  • Concave
    • “caved in”
    • light rays, etc., converge in the center
    • make the image larger or focus energy
mirrors2
Mirrors
  • Parabolic
    • Satellite dishes
    • Lighting the Olympic Torch
mirrors3
Mirrors
  • Convex
    • “curved out”
    • Light rays, etc., spread out from the center
    • Images look smaller, but cover more area
refraction
Refraction
  • bending of a wave as it moves from one medium to another
    • the image difference is caused by a change in the speed of the wave
refraction1
Refraction
  • “edges” of wave “slow down” in a more dense medium and “speed up” in a less dense medium
    • bends towards the “normal” in a more dense medium
    • away from the “normal” in a less dense medium
refraction2
Refraction
  • depends on the
    • type of medium
    • the angle the wave hits the medium
  • waves of light move faster through air than through water
refraction3
Refraction
  • Law of Refraction
refraction4
Refraction
  • Oil & Gasoline Rainbows
    • because of the different densities of oil, gasoline, water, and air, a rainbow-like refraction can form in puddles near well-traveled parking lots
refraction5
Refraction
  • Lenses act to control the refraction of light to focus it in a more desirable manner.
diffraction
Diffraction
  • the bending of waves around a barrier
    • if 1 edge, only one curve
    • if 2 edges, both will bend the wave
interference
Interference
  • caused by the passing of two waves through one another
    • how the waves line up determines how they will interact
interference1
Interference
  • constructive interference –
    • crests and troughs line up
    • build on one another
    • are said to be “in phase”
interference2
Interference
  • destructive interference –
    • crests and troughs don’t line up
    • lessen one another
    • said to be “out of phase”
      • if they are exactly opposite, they will cancel each other out
homework
Homework
  • FINISH YOUR WAVES PACKET
    • We will be going over it on Monday.
  • complete worksheet on back of notes
  • study for upcoming test = Weds next week
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