Two speakers emit sound waves with frequency 4.71 kHz. They are driven by the sa

Question

Two speakers emit sound waves with frequency 4.71 kHz. They are driven by the same oscillator so that they are in phase with each other. I place the speakers side-by-side, and I stand across the room from them. If someone moves ones of the speakers toward me, I hear the total intensity drop and then rise again. How far (cm) did he move the speaker to the point where I heard a minimum intensity due to destructive interference of the sound waves from the two speakers? The speed of sound is 343 m/s.

Explanation / Answer

the difference in phase when destructive interference occurs is pi. so difference in distance. lamda/2. lamda=v/f=0.073 so s=lamda/2=0.036=3.6(cm)

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