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Tuesday February 21, 2012

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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Tuesday February 21, 2012

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  1. 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

  2. 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

  3. 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

  4. 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

  5. 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?

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