Wavefront - A line or surface representing points on a wave that are in phase and moving together, such as the crest of a water wave., Coherence - Two wave sources are coherent if they have a constant phase relationship and the same frequency, allowing for stable interference patterns., Path Difference - The difference in distance travelled by two waves from their sources to a given point, often measured in terms of wavelengths (λ\lambda)., Superposition - When two or more waves meet, their displacements add together vectorially, forming a new resultant wave., Interference - The superposition of two or more coherent waves, producing constructive interference (when waves reinforce) or destructive interference (when waves cancel out)., Phase - A measure of a wave’s position in its cycle, expressed in degrees or radians. Two points are in phase if they have the same displacement and motion direction at the same time.,

Waves - coherence

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