Along the leftward and rightward extensions of the straight line joining \(S_{1}\) and \(S_{2}\) in Figure 17.16, why are there no nodes to the left of \(S_{1}\) and to the right of \(S_{2}\) ?

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Figure 17.16 Less can be more. (a) When both sources generate waves, point Q lies on a nodal line and thus never experiences displacement of the medium (because the waves from the two sources interfere destructively there). If these were sound waves, there would be silence at Q. (b) However, when only one source generates waves, Q experiences their full effect. (a) Both sources generate waves (b) Only S, generates waves P