1.

Consider two coherent monochromatic (wavelength lambda) sources S_(1) and S_(2) separated by a distance d. The ratio of intensity of S_(1) and that of S_(2) at point P is 4. The distance of P from S_(1) if the resultant intensity at point P is equal to (9)/(4), times the intensity due to S_(1) is : (n is a positive integer )

Answer»

`(d^(2)-N^(2)LAMBDA^(2))/(2nlambda)`
`(d^(2)+n^(2)lambda^(2))/(2nlambda)`
`(n lambdad)/(SQRT(d^(2)-n^(2)lambda^(2))`
`(2N lambdad)/(sqrt(d^(2)-n^(2)lambda^(2))`

Answer :A


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