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Interference. Superposition. Two particles cannot occupy the same space at the same time, two waves can When two waves interact, one is super imposed on the other The resultant wave is a combination of both waves. Constructive Interference.

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## Interference

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**Superposition**• Two particles cannot occupy the same space at the same time, two waves can • When two waves interact, one is super imposed on the other • The resultant wave is a combination of both waves**Constructive Interference**• Constructive interference occurs when similar parts of both waves occupy the same point in space • Transverse Waves • Crest meets crest • Trough meets trough • Longitudinal Waves • Compression meets compression • Expansion meets expansion • Resultant wave with greater amplitude**Destructive Interference**• Destructive interference occurs when different parts of both waves occupy the same point in space • Transverse Waves • Crest meets trough • Longitudinal Waves • Compression meets expansion • Resultant wave with much smaller (or zero) amplitude**Phase Difference**• Phase difference refers to the alignment of two waves • A phase difference of 0° or 360° (0, 2π) means the waves are in-phase • Constructive interference • A phase difference of 180° (π) means the waves are out of phase • Destructive interference**Noise Cancelling Headphones**• Uses destructive interference to eliminate background noise • A microphone detects incoming sounds • Speaker produces opposite signal, destructively interferes with ambient noise**Multi-point interference**• Waves created by two or more different sources interfere with each other**Reflectance**• When a wave encounter a boundary some of the wave is reflected back • The reflectance depends on the material of the boundary • The reflected waves interfere with the incoming waves

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