1. The problem statement, all variables and given/known data Two loudspeakers A and B of equal power are separated by a distance of 1.4 m. Both the speakers emit sound waves in phase and of frequency 450 Hz. If a microphone were to be moved from A in a direction perpendicular to AB, at what distances from A will it detect a minimum of sound intensity? ( Take the velocity of sound in air to be 330 m/s ) 2. Relevant equations c=fλ, 3. The attempt at a solution I have no idea where to even start. I tried using Pythagoras' theorem and could go no further.