Two speakers, one directly behind the other, are each generating a 340 Hz sound wave. The speakers are being driven out of phase. What is the smallest separation distance (that is greater than zero) among the speakers that will produce constructive interference at a listener standing in front of them? The speed of sound is 340 m/s. (a) 0.5 m (b) 1.0 m (c) 1.5 m (d) 2.0 m
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