The basic requirement for destructive interference is that the two waves be shifted by half a wavelength.
Now, as you know, v = λν, so just plug in your numbers.
Two speakers, one directly behind the other, are each generating a 264-Hz sound wave. What is the smallest separation distance between the speakers that will produce destructive interference at a listener standing in front of them? Take the speed of sound to be 342 m/s.
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