Physics

Problem

In the figure below, P and Q are two equally intense coherent sources emitting radiation of wavelength

20 \text{ m}

. The separation between P and Q is

5 \text{ m}

and the phase of P is ahead of that of Q by

90^\circ

. A, B and C are three distinct points of observation, each equidistant from the midpoint of PQ. The intensities of radiation at A, B, C will be in the ratio: ![Diagram showing two coherent sources P and Q separated by 5 m. A, B, and C are observation points. A and C are on the line PQ, and B is vertically above the midpoint of PQ. All points A, B, and C are equidistant from the midpoint of PQ.](https://storage.googleapis.com/diraq-contents/homework-question-parsing/marker/20260106T182719Z/9bdb4dcdb477470cb04f41fd1d467495/5fb340ad68b0c71df0b56698b137e35b_img.jpg) (a)

0:1:4

(b)

2:1:0

(c)

0:1:2

(d)

4:1:0

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