all about waves
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| Diffraction | The change in direction of a wave when it encounters an obstacle
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| Refraction | The bending of waves as they pass from one medium to another at an angle
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| Standing wave | A pattern of vibration that resembles a stationary wave
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| Reflection | the bouncing of a wave when it meets a surface or boundary
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| Constructive interference | Interference that increases the amplitude
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| Destructive interference | Interference that decreases the amplitude
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| principle of superposition | sound that produced by interference of sound waves that are used to tune piano strings
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| Beats | point in a standing wave that has no vibration due to destructive interference
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| Interference | The combination of two or more waves that result in a single wave
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| Nodes | Method of adding crest and troughs waves together to describe a new wave
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