Two waves from coherent sources meet at a point with path difference

PHYSICS · Subjective · A Level · Physics · Waves · Waves

Problem

\delta x

. Both waves have the same intensity. Match the following columns.

Column I	Column II
(a) If $\delta x=\lambda/3$	(p) Resultant intensity becomes three times
(b) If $\delta x=\lambda/6$	(q) Resultant intensity remains the same
(c) If $\delta x=\lambda/4$	(r) Resultant intensity becomes two times
(d) If $\delta x=\lambda/2$	(s) Resultant intensity becomes zero