Problem

Two waves from coherent sources meet at a point in a phase difference of

\phi

. Both the waves have same intensities. Match the following two columns.

Column I	Column II
(a) If $\phi = 60^\circ$	(p) Resultant intensity will become four times
(b) If $\phi = 90^\circ$	(q) Resultant intensity will become two times
(c) If $\phi = 0^\circ$	(r) Resultant intensity will remain unchanged
(d) If $\phi = 120^\circ$	(s) Resultant intensity will become three times