By how many wavelengths are the sources in Figure (17.16 a) separated? Figure 17.16 Less can be

By how many wavelengths are the sources in Figure \(17.16 a\) separated?

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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