Tuesday February 21, 2012

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# Tuesday February 21, 2012 - PowerPoint PPT Presentation

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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Presentation Transcript

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

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

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

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
• 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?