Two speakers with opposite phase are positioned 3.5 m apart, both pointing toward a wall 5...

Two speakers with opposite phase are positioned 3.5 m apart, both pointing toward a wall 5.0 m in front of them (Figure 14-36), An observer standing against the wall midway between the speakers heatsdestructive interference. If the observer hears constructive interference after moving 0.84 mto one side along the wall, what is the frequency of the soundemitted by the speakers?

FIGURE 14-36