Two loudspeakers, and are driven by the same amplifier and emit sinusoidal waves in phase. speaker is 2.00 m to the right of speaker . consider point along the extension of the line connecting the speakers, 1.00 m to the right of speaker . both speakers emit sound waves that travel directly from the speaker to point . what is the lowest frequency for which (a) constructive interference occurs at point ; (b) destructive interference occurs at point ?