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Two microwave sources S(1) and S(2) are ...

Two microwave sources `S_(1)` and `S_(2)` are located at a distance of `4 lambda` from each other along `y` -axis, with `S_(1)` at the origin as shown in the figure. A microwave detector `D` moves along the `x` -axis away from `S_(1)`. The first maximum is obtained for `(x gt 0)` equal to `(n lambda)/(6)`. Find `n`. (wavelength of the microwave is `lambda` )
'(##CEN_KSR_PHY_JEE_C27_E01_033_Q06##)'

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