Two speakers, 0.5 m apart, stand in a horizontal plane. The speakers emit a 1.4 kHz tone coherently. In the space in front of the speakers, the sound alternately amplifies and attenuates. At a distance of 10 m from both speakers (point A in the picture) is the central sound amplification.
Why does this amplification occur?
What is the distance of the first amplification from the central amplification (distance of point B from A)?
How many times is the sound amplified to the left and right of the speaker?
