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Wave Interference from "summary" of Fundamentals of Physics by Jearl Walker,David Halliday,Robert Resnick

Wave interference is the phenomenon of two waves coming together to create a new wave pattern. It is the result of the combination of two or more waves that create a combined wave with a different shape than the individual waves.
  1. When two waves move at the same time, they can interfere with each other and create new patterns. This phenomenon is what we call wave interference.
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  3. At specific locations within a wave interference pattern, constructive interference may occur. If two waves meet and their amplitudes combine, the resulting amplitude will get bigger than that of either of the original waves.
  4. Wave interference also occurs if one wave is reflected off a solid object such as a wall or mirror, creating an interference pattern between the incident wave and the reflected wave.
  5. Wave interference is a key concept used in fiber optics and wireless communication technology as these technologies rely on controlling and manipulating the propagation of electromagnetic waves.
  6. In contrast, destructive interference happens when two waves meet and their amplitudes cancel each other out, forming very low or no amplitude areas within an interference pattern.
  7. Interference can also result in sound cancellation; when two identical sound waves meet at the same place, the resulting sound intensity will be zero.
  8. As the two waves cross paths, their energy is either combined or cancelled out, causing a regular pattern of crests and troughs to be formed.
  9. Interference phenomena can also appear in light waves, where the light acts like an interference pattern due to overlapping of diffracted beams followed by splitting of particles.
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Fundamentals of Physics

Jearl Walker

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