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Interference. Interference of Waves. When waves arrive at the same place at the same time, interference occurs. Constructive interference . - When identical parts of a wave overlap Ex: crest/crest, compression/compression Build on each other Also called reinforcement or In Phase.

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## Interference

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**Interference of Waves**When waves arrive at the same place at the same time, interference occurs**Constructive interference**- When identical parts of a wave overlap Ex: crest/crest, compression/compression • Build on each other • Also called reinforcement or In Phase**Destructive interference**-when the opposite parts of a wave overlap • Cancel each other out • Crest/trough, compression/rarefaction • Also called out of phase**Unit 6 Waves/Sound**• Resonance – when the frequency of a forced vibration on an object matches the natural frequency of that object. • Beats – effect that results when 2 tones of slightly different frequencies are sounded together. • Some overlap (louder) and some cancel (softer)**Beats**440 Hz 445 Hz Beats**One Result of Superposition**• Standing Wave: two waves travelling in opposite directions with the same wavelength and frequency**Standing Waves**• The boundary conditions and speed of waves determine which frequencies are allowed. • The ends of the resonant cavity have forced nodes or antinodes**Closed at One End**L Node Antinode

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