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Could someone please help me with this physics question? Watch

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    There are two squares of length L = 0.46 m.
    An observer O is positioned at one corner of each square.
    Two loudspeakers are located at the corners of each square. The speakers produce the same single-frequency tone, and are in phase.
    Calculate the single smallest frequency that will produce both constructive interference in the first square, and destructive interference in the second sqaure.
    Thanks in advance for your help
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    Moved to Physics.
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    What do you mean by two at each corner?
    two at every corner (16 speakers) or two in each square, in seperate corners?
    A diagram would help :P
 
 
 
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