Two coherent sources send waves of equal amplitude to a point

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

Two coherent sources send waves of equal amplitude to a point PP. The phase difference between the two waves at PP is 120∘120^{\circ}. If the maximum possible intensity due to the sources is I0I_0, the intensity observed at PP is (a) 0.75 I00.75\,I_0 (b) 1.00 I01.00\,I_0 (c) 0.25 I00.25\,I_0 (d) 0.50 I00.50\,I_0

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