ydse/wave optics lectures/Two coherent sources of sound, S₁ and S₂, produce sound waves of the same

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Two coherent sources of sound, S₁ and S₂, produce sound waves of the same wavelength, a = 1 m, in phase. S₁ and S₂ are placed 1.5 m apart (see fig.). A listener, located at L, directly in front of S₂ finds that the intensity is at a minimum when he is 2 m away from S2. The listener moves away from S₁, keeping his distance from S₂ fixed. The adjacent maximum of intensity is observed when the listener is at a distance d from S₁. Then, d is :