For which of the following path difference, the superimposing waves will not interfere constructively?

For which of the following path difference, the superimposing waves will not interfere constructively? Correct Answer 11.5λ

A path difference of 11.5λ between the two waves will not result in constructive interference. For the waves to interfere constructively, the differences in the travel path must be equal to integer multiples of the wavelength.
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