reflection, refraction, diffraction, interference...2013/04/10 · objectives wwbat… describe and...
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Reflection, Refraction, Diffraction, Interference
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Objectives WWBAT…
Describe and differentiate between reflection, refraction, diffraction, and interference
Describe the change in speed or wavelength for a refracted wave based on a diagram
Predict the shape of a wave formed by interference
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The 4 Types of Wave Behaviors Reflection
Refraction
Diffraction
Interference
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Reflection When a wave hits a surface and rebounds off that
surface in a different direction
Frequency Wavelength Speed
Stays the same Stays the same Stays the same
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Refraction A wave changes media and changes speed
Causes waves to “bend”
Material a wave is moving through
i.e. air, water, glass, etc.
Frequency Wavelength Speed
Stays the same Decrease/Increase Decrease/Increase
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Refraction How can we tell which medium a wave moves faster
in?
Wavelength is longer in deep water
Wave moves faster in deep water
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Refraction How can we tell which medium a wave moves faster
in?
If the wave moves slower, it will bend away from the boundary ( (towards the perpendicular).
If the wave moves faster, it will bend towards the boundary.
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Refraction Example: Does the wave move faster in air or in glass?
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Refraction You Try: Does the wave travel faster in air or in water?
Air
Water
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Diffraction Wave passes through a slit or around a boundary
Creates a “ripple” effect
Frequency Wavelength Speed
Stays the same Stays the same Stays the same
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Interference Two or more waves collide and their amplitudes add
together or cancel out
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Interference Will they add or cancel?
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Interference Will they add or cancel?
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Interference Will they add or cancel?
Amplitudes will add if both crests align
Amplitudes will cancel if their crests and troughs align
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Interference Example: Determine the resultant waveform from the
interference of Wave 1 and Wave 2.
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Interference YouTry: Determine the resultant waveform from the
interference of Wave P and Wave Q.
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Interference CONNECTION ALERT!
For those of you in precalculus studying sequences and series, Fourier series are a VERY important way of describing complex waveforms (like electrical signals) as a sum of interfering sinusoids