Question

Sets of travellling waves are given as shown in above figure. Identify which of the following set of wave will soon show constructive interference?

• A. A
• B. B
• C. C
• D. D
• E. E

Answer 1

The correct option is D D

Superposition principle states that the resultant displacement at any instant is the vector sum of the displacements produced by two waves separately and at the point where the resultant displacement is maximum , there is constructive interference.

we can see from the given figures that in set $D$ displacement will be maximum after superposition because displacements of waves are in the same direction so the vector sum of displacements will be maximum , therefore it will show constructive interference.