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Q.

There is a destructive interference between the two waves of wavelength λ coming from two different paths at a point. To get maximum sound or constructive interference at that point, the path of one wave is to be increased by

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a

λ4

b

λ

c

λ2

d

3λ4

answer is B.

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Detailed Solution

With path difference λ2, waves are out of phase at the point of observation.  

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