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Two speakers emit a sound with a frequency of 550.0Hz. At what distance should they be placed to maximize destructive interference?

I have the steps in solving this problem written on my worksheet, and it says that the speakers should be placed at 1/2 wavelength. The thing I don't understand is WHY they should be placed there. Other than that, I understand how to finish solving the problem. I just don't understand what the deal is with 1/2 wavelength.

Thank you!