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Wave Interactions. Reflection. The bouncing back of a wave when it meets a surface or boundary. Diffraction. The bending of a wave as it passes an edge or an opening. This is why you can hear sound around a corner. Refraction. The bending of waves as they pass from one medium to another.

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## Wave Interactions

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**Reflection**• The bouncing back of a wave when it meets a surface or boundary.**Diffraction**• The bending of a wave as it passes an edge or an opening. • This is why you can hear sound around a corner.**Refraction**• The bending of waves as they pass from one medium to another. • “Broken pencil” trick**Interference**• Waves that exist in the same place at the same time experience interference.**Interference**• Constructive: Two crests or two troughs will add together to make a larger crest or trough. They do not average out. • Destructive: Crest meets trough; amplitude is smaller or completely cancels out.**Interference**• Of light: creates rainbows in oil or soap bubbles. • Of sound: creates beats in music.**The Doppler Effect**• The apparent change in frequency of a moving object to the observer. • Ex: NASCAR, ambulance

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