wave actions
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TRANSCRIPT
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Wave Actions
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Wave Shapes
• Wave front– shape of a wave is determined by the shape of
wave fronts1. A plane wave look like straight lines
2. A circular wave’s crests are in circles
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Wave Interactions
• Waves lose energy due to friction• Damping – Amplitude of the wave decreases
over time
• As a wave travels, it approaches boundaries of different mediums– Reacts depending on type of boundary
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Types of Wave Interactions
1. Absorption - when a wave’s energy dies out in a soft material (damping)– Ex: Yelling into a pillow – the soft pillow absorbs
the sound
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2. Reflection - when a wave hits a hard boundary and bounces off– Ex: an echo – when you yell, the waves bounce off
a wall in the distance and travel back to you
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3. Diffraction - a wave drags around a corner, causes part of the wave to turn– Ex: talking to someone around a corner
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• Diffraction also happens when plane waves go through a small opening – they turn into circular waves
• Ex: being able to hear someone through a door that is cracked open
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4. Refraction - when a wave bends as it enters a new medium • it speeds up or slows down depending on
the medium– Ex: Try catching a fish by reaching for what you
see.
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Phase
• In-phase– 2 waves are in same part
of their cycles
• Out-of-phase– 2 waves at different
points of their cycles
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Interference:
• Interference happens when two or more waves come together1. Constructive Interference
energy of two waves in-phase add together
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2. Destructive Interference energy of two waves out-of-phase subtract from each other, causing cancellation
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Works Cited
• Hsu Ph.D., Tom. Foundations of Physical Science. 1st ed. Peabody: Cambridge Physics Outlet, 2002. 195-202. Print.
• Murray, Stephen. "Worksheets." Mr. Murray’s Science Website: IPC Worksheets. N.p., 2009. Web. 18 May 2012. http://www.cstephenmurray.com/Acrobatfiles/IPC/ch11to13/chap12no2.pdf .