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Tuesday February 21, 2012. Warm Up Which of the following describes when a wave bounces off a barrier? refraction wave reflection rarefaction. Classwork: #55 Wave Behavior Foldable Homework: Complete foldable questions Quiz Thursday .

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slide1

Tuesday February 21, 2012

  • Warm Up
  • Which of the following describes when a wave bounces off a barrier?
  • refraction
  • wave
  • reflection
  • rarefaction

Classwork:

#55 Wave Behavior Foldable

Homework:

Complete foldable questions

Quiz Thursday

slide2

Pg 1 – When a wave hits a barrier this can happen……

  • Reflection is when a wave bounces back after hitting a barrier
    • Not all waves are reflected, if the wave goes through a substance it is transmitted
  • Diffraction – when waves curve or bend as they go around a barrier or through an opening
    • Sound diffracts more than light because sound typically has longer wavelengths
slide3

Pg 2: When a wave enters a new medium this happens….

  • Refraction – bending of a wave as it passes into a new medium
    • As it enters the new medium, the wavelength and wave speed change, causing the wave to travel in a new direction making it look like it bends
slide4

Pg 3 & 4 : When 2 or more waves meet this can happen….

  • Constructive interference – when 2 waves combine to create a wave with larger amplitude
    • EX: if you all talk at a whisper the sound waves combine to make a larger noise
  • Destructive interference – when 2 or more waves combine and cancel each other out
    • EX: “Beats” headphones produce low frequency sound waves that block out noise
  • Standing wave – certain parts of wave always undergo destructive interference
      • The wave reflects back creating areas that are flat (destructed) and areas that are larger (constructed)
  • Resonance – 2 objects naturally vibrate at same frequency
    • 1 object vibrates causing other to vibrate as well
pg 5 6 wave behavior questions
Pg 5 & 6 Wave Behavior Questions
  • Observe the pencil in the glass of water. What concept does this illustrate? Explain how this happens
  • What concept describes your ability to hear someone talking around the corner. Explain what is happening to the sound waves
  • What is the difference between the 2 types of interference?
  • Explain how the “Beats” headphones block out all outside noise?