Show that (vector k vector r, t) may represent a plane wave where vector k is normal
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Show that Ψ(vector k• vector r, t) may represent a plane wave where vector k is normal to the wavefront. [Let vector r1 and vector r2 be position vectors drawn to any two points on the plane and show that ψ( vector r1, t) = ψ( vector r2, t).]
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