# Question: two speakers a and b are 400 m apart and...

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Two speakers, A and B, are 4.00 m apart and are emitting identical in-phase sound waves. The speed of sound in air is 340 m/s. Consider a line which is the perpendicular bisector of the line connecting the two speakers. The first interference maximum occurs at ±25.15 o from this line. (a) What is the frequency of the sound emitted? (b) Find the rest of the angles where constructive and destructive interference occur. (c) If the speakers are aboard a pick-up truck that is traveling at 20 m/s, at what angles from the central line will the two first interference maxima occur (in front of the truck and behind the truck)?