At what distances from $B$ will there be destructive interference?

Two identical loudspeakers, A and $B,$ are $2\mathrm{.}00$ m apart. The loudspeakers are driven by the same amplifier and emit $784$ Hz sound waves in all directions. Take the speed of sound in air to be $344\frac{m}{s}.$ A small microphone is moved out from point $B$ along a line perpendicular to the line connecting A and $B($line $BC$ in the figure $($Figure $1)).$

Figure

$1$ of $1$

Part C

If the frequency is made low enough, there will be no positions along the line $BC$ at which destructive interference occurs. How low must the frequency be for this to be the case?

Express your answer in hertz.

At what non$-$infinite distances from $B$ will there be constructive interference?

Enter your answers in ascending order separated by commas. Express your answers in meters.

At what non$-$infinite distances fro

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$x_1,x_2,x_3,x_4$

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At what non$-$infinite distances fro

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$x_1,x_2,x_3,x_4$

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Part B