Frequency of sound coming from speakers

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The discussion centers around a physics problem involving sound intensity from speakers positioned 1 meter apart, with the observer 3 meters away. As the observer moves to 0.75 meters from the center, they experience a decrease in sound intensity to zero, followed by a return to the original volume. The relevant equation for frequency observed versus emitted is provided, suggesting a relationship with the observer's movement. The main challenge expressed is a lack of clarity on how to approach the problem. Understanding the concepts of sound waves and intensity variation is crucial for solving this scenario.
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Homework Statement



You are L = 3 m away from a pair of speakers playing a pure tone separated by a distance of d = 1 m. If you walk from the center to a distance of y = 0.75 m, you hear the intensity decrease to zero, then increase all the way back to the initial volume.

Homework Equations



frequency(observed) = frequency(emitted) x (1 + u/v)

The Attempt at a Solution



I have no idea where to get started!
 
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