Asked by Robert
                An observer is located directly between two  speakers, located 20m apart. The speakers are in phase with each other, and both are emitting a sound with a frequency of 60Hz. How far away from the centre should the observer move to get the first destructive interference? 
            
            
        Answers
                    Answered by
            bobpursley
            
    you want them to be 1/2 wavelength off.
on path length. ..
    
on path length. ..
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