Question

The diagram below shows two sources, $A$ and $B$, vibrating in phase in the same uniform medium and producing circular wave fronts.
Which phenomenon occurs at point $P$?

• A. Destructive interference
• B. Constructive interference
• C. Refletion
• D. Refraction

Answer 1

The correct option is B Constructive interference

Wave fronts for a source represents locus of points at same phase. A and B are vibrating in phase. Hence, all the wave fronts shown in the diagram are in the same phase. At P, there are wave fronts of both A and B. Hence, the waves of A and B are at same phase at P. Hence, constructive interference occurs at P.