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Super Position of Waves

When two or more than two waves superimpose over each other at a common particle of the medium, then the resultant displacement (y) of the particle is equal to the vector sum of the displacements (y1 and y2) produced by individual waves, i.e., 94748.png.
Fig. 5
Phase The argument of sine or cosine in the expression for displacement of a wave is defined as the phase. For displacement, y = a sin ωt; term ωt = phase or instantaneous phase.
Phase difference (φ) The difference between the phases of two waves at a point is called phase difference, i.e., if y1 = a1 sin ωt and y2 = a2 sin (ωt + φ) so phase difference = φ
Path difference () The difference in path length’s of two waves meeting at a point is called path difference between the waves at that point. Also 94760.png
Time difference (TD) Time difference between the waves meeting at a point is 94766.png

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