Suppose that the separation between two speakers A and B is 4.80 m and the speakers are vibrating in-phase. They are playing identical 134-Hz tones and the speed of sound is 343 m/s. An observer is seated at a position directly facing speaker B in such a way that his line of sight extending to B is perpendicular to the imaginary line between A and B. What is the largest possible distance between speaker B and the observer, such that he observes destructive interference

Explanation:

From the question we are told that

Distance b/w A&B

Frequency

Sound speed

Generally the equation for wavelength is mathematically given as

Generally the destructive interference X is mathematically given by

Therefore the destructive interference is

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