Question

There is a destructive interference between the two waves of wavelength l 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

[MP PET 1985]

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

With path difference $\frac{\lambda }{2}$, waves are out of phase at the point of observation.