Two identical loudspeakers are locates at point $A$ and $B$, $2.00m$ apart. The loudspeakers are driven by the same amplifier and produce sound waves with a frequency of $784Hz$. Take the speed of sound in air to be $344m/s$. A small microphone is moved out from point $B$ along a line perpendicular to the line connecting $A$ and $B$ ( line $BC$ in fig ) 
At what distances from $B$ will there be destructive interference ?

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