Two loudspeakers, A and B, are placed 4 meters apart and facing each other. The loudspeakers produce sound at 171 hertz in phase with one another. A microphone is moved with varying speed along a straight line that joins A and B. Which of the following statements is true?

W) The microphone detects sound with no amplitude fluctuations as it moves

X) The microphone detects sound with amplitude fluctuations that increase as its speed decreases

Y) The microphone detects sound with amplitude fluctuations that increase as its speed increases

Z) The microphone detects no sound
Y) THE MICROPHONE DETECTS SOUND WITH AMPLITUDE