wo​ loudspeakers S1 and S2 are​ at a distance of​ each other. Point Q is located at y = 1.7 m above loudspeaker S2 while point P is located at x = 4.2 m in front of loudspeaker S1. The two loudspeakers emit a sound of frequency f = 98 Hz in phase. It is assumed that the intensity does not decrease with the distance from the loudspeakers, and that the modulus of the speed of sound is 340 m/s. What is the minimum value of d for which the sound intensity is zero at each of the following points: (a) P; ​(b) Q​?

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.