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Interference describes different waves superposing to form a resultant wave of greater, lower, or the same amplitude. Normally, it involves interaction of waves that are correlated (coherent) with each other, either because they come from the same source, or because they have the same or nearly the same frequency. Interference effects can be observed with all types of waves, e.g., light, radio, acoustic, surface, or matter waves.

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How can a wave interfere with itself?

In some field of research like quantum field theory, particles are but excitation of a field and therefore naturally get a wave like behavior. If you study the Maxwell equation you will find that in a …
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