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Two identical loudspeakers are located a...

Two identical loudspeakers are located at points A & B, 2 m apart. The loudspecakers are driven by the same amplifier. A small detector is moved out from B along a line perpendicular to the line connecting A & B. Taking speed of sound in air as `332 m"/"s`. Find the frequency below which there will be no position along the line BC at which destructive interference occurs.

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83 Hz
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